Chisen OPzS2-420 2V420Ah Tubular Flooded Battery

30-Second Read: Chisen OPzS2-420

• Model & Specs: Chisen OPzS2-420 | 2V 420Ah (C10) | Tubular Flooded Battery

• Technology: Tubular positive plate + liquid dilute sulfuric acid electrolyte + vent plug structure (standards covered in §4)

• Core Advantages: Cycle life 1500-2500 cycles (80% DOD) / float design life 20+ years (25°C)

• Typical Applications: Telecom base stations (especially manned) + PV/Wind energy storage + data center UPS + railway + marine

• §1 Chisen OPzS2-420 Product Definition and 4 Core Advantages

Chisen OPzS2-420 is a 2V 420Ah tubular flooded battery.

Technology roadmap: tubular positive plate + liquid dilute sulfuric acid electrolyte + vent plug structure (standards covered in §4).

Application scenarios: OPzS2-420 is a 2V cell. 24 cells in series form a 48V system / 54 cells in series form a 108V system (compatible with 110V) / 108 cells in series form a 216V system (compatible with 220V) / 190 cells in series form a 380V three-phase DC system.

Fields of application: telecommunications / cable TV / power / security / UPS / control equipment / medical equipment / railway / PV / alternative energy.




Advantage	Technical Implementation	Customer Value
Tubular positive plate structure	Tubular positive plate + flooded type + transparent SAN plastic container	Cycle life 1500-2500 cycles (80% DOD)
20+ year float design life	Float voltage 2.24V/cell (25°C), equalize charge 2.35-2.40V	TCO better than AGM
On-site visual maintenance	Transparent container for on-site liquid level + plate inspection; refill every 3-6 months	Suitable for manned rooms, railway, marine
Multi-standard coverage	6 international/regional/industry standards (see §4)	Marketable to 60+ countries







Chisen CHISEN brand established in 2002, specializing in tubular batteries for 20+ years, exported to 60+ countries, supplying industrial customers in telecommunications / power / data centers / PV / railway / medical sectors.

• §2 Chisen OPzS2-420 Core Specification Quick Reference

The table below is the OPzS2-420 core specification quick reference (detailed standards in §4, application scenarios in §7, float voltage details in §12).




Parameter	Value	Standard / Note
Rated Voltage	2V (DC)
Rated Capacity	420Ah (C10)
Model	OPzS2-420
Series	Tubular Flooded Battery
Applicable Standards	IEC 60896 + DIN 40736-1 + GB/T 19638 (6 standards, see §4)
Dimensions (L×W×H)	145 × 206 × 470 mm
Total Height (with terminals)	525 mm
Terminal Type	Φ20-M8
Terminal Torque	10-12 N·m
Operating Temperature (Discharge)	-40°C ~ 60°C
Operating Temperature (Charge)	-30°C ~ 55°C
Operating Temperature (Storage)	-25°C ~ 45°C
Float Voltage	2.24V/cell (25°C)
Float Temperature Compensation	-3.3mV/°C/cell
Equalize Voltage	2.35-2.40V/cell (25°C)
Equalize Temperature Compensation	-5mV/°C/cell
Cycle Charging Voltage	2.35-2.40V/cell (25°C)
Max Charging Current	84A
Max Discharge Current (5s)	1000A
Self-discharge Rate	3% / month (storable 9-12 months without recharging, 25°C)
Internal Resistance (fully charged / 25°C)	0.56 mΩ
Short-circuit Current	3500A
Cycle Life	1500-2500 cycles (80% DOD)
Float Design Life	20+ years (25°C)
Transport / Sea Freight	IMDG Class 8 / UN2794 / MSDS
Certifications	Arranged per customer requirements (see §4)







• §3 Chisen OPzS2-420 Model Naming Rules — OPzS Letter Breakdown and DIN 40736-1 Definition

Chisen OPzS2-420 model naming follows the German DIN 40736-1 (tubular flooded) + international IEC 60896 standard naming rules. OPz is the abbreviation of the German word "Ortsfeste Panzerplatten", meaning "stationary tubular armored plate".

OPzV / OPzS letter meaning comparison table (DIN 40736-1 definition):




Letter	German full name / meaning	Technical meaning
OPz	Ortsfeste Panzerplatten / stationary tubular armored plate	Positive plate = tubular plate
S	V = Valve Regulated / V = Vented	Open type / flooded / vent plug
2	2V cell voltage	48V = 24 cells / 110V = 54 cells / 220V = 108 cells in series
420	420Ah capacity (C10 / 10-hour rate)	Discharge to 1.80V/cell at 10-hour rate







• §4 Chisen OPzS2-420 Applicable International / European / Chinese / UK / North American Standards List

Chisen OPzS2-420 complies with the following 6 international / regional / industry standards (product design basis). Standard compliance = sales compliance + customs clearance + one-pass project bidding.




Standard	Number	Scope of application
International IEC	IEC 60896-11:2002	Stationary vented (flooded) batteries
German DIN	DIN 40736-1:1985	Tubular positive plate stationary batteries (gold standard)
Chinese National Standard	GB/T 19638.2-2014	Stationary vented batteries (market sales compliance)
Chinese Telecom	YD/T 1360	Telecom operator backup power (recommended compliance)
European	Eurobat Long Life	European battery life classification (> 12 years float)
UK / North America	BS 6290 Part 4 / UL 1989	UK / North American backup power market







Note: third-party inspection certificates / destination-country special certifications (SONCAP / PVOC / SASO / BIS / ESMA) can be arranged per customer requirements (supported by mainstream agencies such as SGS / TUV / BV / CTI).

• §5 Chisen OPzS2-420 Physical Structure and Materials (Tubular Positive Plate vs Flat Plate)

Chisen OPzS2-420 physical structure design (tubular positive plate is the core; cycle life is 1.5-2x higher than flat plate batteries):




Component	Material / Spec	Description
Positive grid	Die-cast tubular positive plate with low antimony alloy	Fiberglass tube wraps Pb-Sb alloy
Negative grid	Lead-calcium alloy pasted negative plate	Improves active material utilization
Separator	Low-resistance PVC composite separator	Low resistance / high porosity / aging resistant
Electrolyte	High-purity low-density dilute sulfuric acid	Specific gravity 1.24 ± 0.01 g/cm3 (fully charged)
Container	Transparent SAN plastic	Liquid level and plate condition visible
Cover	High-strength ABS resin	Sealed / flame retardant
Acid-proof vent	Funnel-type acid-proof vent	With acid filtration and flame-retardant explosion-proof function
Vent plug	Explosion-proof vent plug	Automatic pressure regulation (0.05-0.15 MPa)







OPzS transparent container advantage: liquid level height + plate color change (sulfation detection) can be observed on site

• §6 Chisen OPzS Series — Full Specification Table of 18 Models, 100Ah-3000Ah

Chisen OPzS series — 18 models from 100Ah to 3000Ah (tubular flooded / Tubular Flooded). All comply with IEC 60896-11 + DIN 40736-1 + GB/T 19638.2-2014 standards. Models within the same series can be flexibly mixed in series to form different voltage systems (48V = 24 cells / 110V = 54 cells / 220V = 108 cells / 380V = 190 cells).




Item	OPzV (Tubular GEL VRLA)	OPzS (Tubular Flooded)
Electrolyte	Nano silica-based gel (fixed, non-flowing)	Dilute sulfuric acid 1.24 g/cm3 (liquid)
Positive plate	Die-cast tubular (Pb-Ca alloy)	Die-cast tubular (Pb-Sb low antimony alloy)
Applicable DIN standard	DIN 40472:2015 (tubular valve-regulated)	DIN 40736-1:1985 (tubular flooded)
Container	ABS flame retardant UL94 V-0 (opaque)	SAN transparent plastic (liquid level visible)
Short-circuit current (100Ah)	1700 A	1500 A
Internal resistance (20°C)	0.0011 Ohm (1.1 mΩ)	0.001 Ohm (1.0 mΩ)
Max charging current	30 A (0.30C10)	20 A (0.20C10)
Self-discharge rate (20°C fully charged)	2%/month	3%/month
Float voltage (25°C)	2.25-2.27V/cell	2.24V/cell
Equalize voltage (25°C)	2.30-2.35V/cell	2.35-2.40V/cell







II. Environmental adaptability (4 rows):




Parameter dimension	OPzV GEL valve-regulated	OPzS flooded
Operating temperature (discharge)	-40°C ~ 65°C (gel withstands high temp)	-40°C ~ 60°C
Operating temperature (charge)	-30°C ~ 65°C	-30°C ~ 55°C
Capacity - temperature (40°C)	about 105%	108%
Capacity - temperature (-20°C)	about 55%	about 65% (estimated)







III. Life and cycling (4 rows):




Parameter dimension	OPzV GEL valve-regulated	OPzS flooded
Float life (25°C)	20+ years	20+ years (requires periodic refilling)
Float life (30°C)	about 10 years	8-10 years
Cycle life (DOD 80%)	≥ 1500 cycles	1500-2500 cycles
Cycle life (DOD 50%)	2200+ cycles	2500-4000 cycles







IV. Maintenance and installation (4 rows):




Parameter dimension	OPzV GEL valve-regulated	OPzS flooded
Water refilling	Maintenance-free (no refilling needed)	Refill every 3-6 months (distilled water)
Acid mist emission	Minimal (valve-regulated sealed + acid filter)	More (flooded + filter vent)
Installation orientation	Vertical / horizontal / side (not inverted)	Must be vertical (electrolyte would leak)
On-site inspection	Not possible (opaque container)	Possible (transparent container to check liquid level / plates)







V. Commercial and decision-making (4 rows):




Parameter dimension	OPzV GEL valve-regulated	OPzS flooded
Purchase cost (relative)	Higher (+15-25% vs OPzS)	Lower (mature technology)
Maintenance cost (20 years)	Very low (maintenance-free)	Medium (labor + distilled water)
TCO (20 years)	Medium (higher purchase + low maintenance)	Low (lower purchase + medium maintenance)
Recycling value	High (lead recyclable)	High (lead recyclable)







VI. Selection decision conclusion (if you care about X → choose Y):




Concern / application scenario	Recommended choice	Reason
Unattended / remote / island / border base stations	OPzV	Maintenance-free + vertical/horizontal/side installation + valve-regulated sealing (40% O&M savings)
Tropical / desert / extreme high temperature rooms (>45°C sustained)	OPzV	Gel withstands high temperature (charge -30~65°C vs OPzS -30~55°C)
Deep cycle applications (PV daily 1 cycle at 80% DOD)	OPzS	50% higher cycle life (2500 vs 1500 cycles)
Large UPS data centers (>500 kVA high rate)	OPzS	Long deep-cycle life (1500-2500 cycles) + large capacity (2000+ Ah) reduces series cell count
Mobile equipment / tilted installation / vehicle batteries	OPzV	Vertical/horizontal/side installation (valve-regulated, no leakage)
Transparent inspection / on-site maintenance (manned rooms with regular patrol)	OPzS	SAN transparent container + filter vent (visible maintenance + acid mist filtration)







• §9 Tubular Battery Selection Decision Table — OPzV / OPzS / AGM Comparison

Comparison of Chisen OPzS battery types in large industrial energy storage and backup power scenarios, with selection recommendations:

Selection decision table (if your application is X → recommended Y): large data center UPS (>500 kVA) / railway signaling / emergency lighting / ship main control / manned rooms → OPzS (flooded type with longer life + lower cost + higher short-circuit current). Data center UPS / 5G base station / PV energy storage / unattended / remote deployment → OPzV. Automotive starting / e-bikes / motorcycles / small UPS / short backup (<30 min) → AGM flat plate.




Comparison item	OPzS (tubular flooded)	OPzV (tubular gel valve-regulated)	AGM (flat plate valve-regulated)
Positive plate structure	Tubular	Tubular	Flat plate
Electrolyte	Dilute sulfuric acid (flooded)	Nano gel (GEL)	AGM fiberglass
Valve-regulated	No (open + vent)	Yes (sealed)	Yes (sealed)
Maintenance-free	Requires refilling (3-6 months)	Maintenance-free	Maintenance-free
Cycle life (80% DOD)	1500-2500 cycles	≥ 1500 cycles	500-1000 cycles
High-rate discharge capability	Medium (1500-1600A)	Strong (1500-1700A)	Medium (800-3500A)
Installation orientation	Must be vertical	Vertical/horizontal/side	Vertical/horizontal/side
Transparent container for inspection	Yes (SAN transparent)	No (ABS opaque)	No (ABS opaque)
Typical applications	Large UPS / railway / ship / emergency lighting	UPS / base station / PV / unattended	Auto starting / small UPS / e-bikes
Relative price	Low	Medium	Low







• §10 Chisen OPzS2-420 Capacity Sizing Formula + Solar and Wind Configuration Parameters

Battery capacity (Ah) = load power (W) × backup duration (h) ÷ bus voltage (V) ÷ inverter efficiency ÷ temperature coefficient

Where: inverter efficiency UPS 0.85 / DC load 1.0; temperature coefficient 25°C = 1.0 / 35°C = 0.85 / 45°C = 0.70 (high-temperature derating); 20-30% margin recommended.

Example 1: telecom base station 48V system, 4-8h backup then generator switchover. Load 1 kW, backup 4h, bus 48V, efficiency 0.85, temperature 25°C. Capacity = 1000 × 4 ÷ 48 ÷ 0.85 ÷ 1.0 ≈ 98Ah. Recommended: OPzV2-100 (24 cells in series for 48V), 2% margin.

Example 2: PV grid-connected/off-grid storage 5kW system, 4h backup. Load 5 kW, backup 4h, bus 48V, efficiency 0.85, temperature 25°C. Capacity = 5000 × 4 ÷ 48 ÷ 0.85 ÷ 1.0 ≈ 490Ah. Recommended: OPzV2-500 (24 cells in series for 48V), 2% margin.

Example 3: 110V DC panel, 10h backup. Load 0.5 kW, backup 10h, bus 110V, efficiency 1.0 (DC load), temperature 25°C. Capacity = 500 × 10 ÷ 110 ÷ 1.0 ÷ 1.0 ≈ 45Ah. Recommended: OPzV2-100 (54 cells in series for 108V), 100% margin.

Example 4: 220V three-phase DC industrial power, 30 min full-load backup. Load 100 kW, backup 0.5h, bus 220V, efficiency 1.0, temperature 25°C. Capacity = 100000 × 0.5 ÷ 220 ÷ 1.0 ÷ 1.0 ≈ 227Ah. Recommended: OPzV2-250 (108 cells in series for 220V), 10% margin.

More series configurations (48V = 24 cells / 110V = 54 cells / 220V = 108 cells / 380V = 190 cells) are detailed in §7 application scenarios.

Solar / wind system application configuration parameters (CHISEN spec sheet p1 measured):




Parameter	Setpoint	Description
Over voltage disconnect	2.45 ± 0.01V/cell @25°C	Over-voltage disconnect (charge complete / solar controller disconnects battery)
Regulation/equalize voltage	2.40 ± 0.01V/cell @25°C	Equalize voltage (periodic balancing, every 30-60 days)
Array reconnect voltage	2.25 ± 0.005V/cell @25°C	Solar array reconnect voltage (reconnect after float recovery)
Float voltage setting	2.27 ± 0.005V/cell @25°C	Float voltage (steady state of PV standalone power)
Low voltage alarm	1.95 ± 0.005V/cell @25°C	Low voltage alarm (load about to disconnect)
Low voltage disconnect	1.90 ± 0.005V/cell @25°C	Low voltage disconnect (load disconnected to protect battery from over-discharge)
Load reconnect voltage	2.09 ± 0.01V/cell @25°C	Load reconnect voltage (reconnect after over-discharge recovery)
Temp. compensate coefficient	-3 ~ -5 mV/°C/cell	Temperature compensation coefficient (float -3.3mV, equalize -5mV)







Free engineering sizing: send "system voltage + load power + backup duration + operating temperature" to sales@chisen.cn, receive a complete Excel sizing sheet + quotation within 24 hours.

Chisen OPzS2-420 multi-capacity / multi-power discharge rating table (CHISEN spec sheet p2 measured, 20°C cut-off voltage 1.80V):




Discharge time	Discharge current / power	Capacity (Ah)	Power (W/cell)
1 HR	50A	50 Ah	108 W/cell
3 HR	84A	75 Ah	137 W/cell
5 HR	17A	85 Ah	163 W/cell
10 HR	10A	100 Ah	198 W/cell
24 HR	4.45A	107 Ah	214 W/cell
48 HR	2.31A	111 Ah	220 W/cell
72 HR	1.6A	115 Ah	225 W/cell
100 HR	1.2A	120 Ah	240 W/cell
120 HR	1.02A	122 Ah	247 W/cell
240 HR	0.54A	130 Ah	261 W/cell







Step 1 Confirm system voltage + number of cells in series: telecom base station / PV / UPS / railway / medical / marine → 24 cells in series (48V system) / 54 cells (108V, compatible with 110V DC panels) / 108 cells (216V, compatible with 220V industrial power) / 190 cells (380V three-phase DC data center UPS).

Step 2 Select capacity: calculate with the formula "battery capacity = load power × backup duration ÷ bus voltage ÷ inverter efficiency ÷ temperature coefficient" → choose the closest standard capacity (100 / 200 / 300 / 500 / 1000 / 1500 / 2000 / 3000 Ah), reserve 20-30% margin.

Step 3 Check cycle life + battery type: float backup (base station / UPS) → OPzV (maintenance-free 20+ years); deep cycle (PV daily cycle) → OPzV or OPzS (tubular ≥1500 cycles); high current (data center UPS > 500 kVA) → OPzS (short-circuit 3500A+).

Step 4 Check dimensions + weight: OPzV2-100 dimensions 103×206×390mm / weight 13.2kg (incl. electrolyte), OPzS2-420 dimensions 103×206×409mm / weight 12.6kg (incl. electrolyte); reserve ≥ 50mm heat dissipation spacing for battery cabinets / racks.

Step 5 Select after-sales + certifications: project bidding / customs clearance requires corresponding national standards (see §4); CHISEN recommended (20+ year brand + 60+ country export experience + assistance with destination-country certifications on demand).

• §11 Chisen OPzS2-420 Cycle Life Details + 20-Year TCO Life Cycle Cost Comparison (Tubular vs AGM)

Chisen OPzS2-420 cycle life 1500-2500 cycles (80% DOD, IEC 60896-11 test conditions, 25°C). The tubular + flooded combination is the biggest advantage of OPzS — 1.5-2x longer life than flat plate AGM, and 30-50% higher than OPzV valve-regulated (because positive active material is more fully maintained).

Tubular vs flat positive plate cycle life comparison (DIN 40736 + measured):




Depth of discharge (DOD)	OPzS flooded (tubular)	OPzV valve-regulated (tubular)	AGM flat plate (valve-regulated)
80% DOD (deep cycle)	1500-2500 cycles	≥ 1500 cycles	500-1000 cycles
50% DOD (medium cycle)	2500-4000 cycles	2200+ cycles	750-1500 cycles
30% DOD (shallow cycle)	4500-6500 cycles	3500+ cycles	1500-3000 cycles
Float standby (no cycling)	20-25 years (25°C)	20+ years (25°C)	10-15 years (25°C)
Application scenario	Depth of discharge	Cycle count	Service years
Float backup / large UPS / manned room with regular refilling	0% DOD	—	20+ years
Railway signaling / emergency lighting / solar off-grid	60% DOD	2000+ cycles	8-12 years
UPS high-rate pulse discharge	30% DOD	3500+ cycles	12+ years
Diesel engine starting (high short-circuit current)	5% DOD	> 10000 cycles	15+ years







OPzS flooded type requires water refilling every 3-6 months, but the maintenance cost is offset by 1.5-2x longer life; from a TCO total cost of ownership perspective, OPzS outperforms OPzV in large UPS / railway / marine scenarios.

v25 addition: combined cycle life and TCO life cycle cost demonstration (typical 48V 420Ah backup system, 20-year total cost of ownership):




Cost item	OPzV	OPzS	AGM flat plate valve-regulated
	Tubular gel valve-regulated (Chisen)	Tubular flooded (Chisen)
Initial purchase cost (incl. installation)	Medium (tubular gel)	Lower (tubular flooded / mature process)	Lowest (flat plate valve-regulated)
Design service life	20+ years (25°C float)	20-25 years (25°C float, with regular maintenance)	8-12 years (25°C float)
Replacements needed in 20 years	0 times (buy once, use for life)	0 times (no replacement in 20 years with good maintenance)	1-2 times (around year 8 / year 16)
Annual maintenance cost	Very low (maintenance-free, only cleaning)	Medium (refill + clean every 3-6 months)	Medium (voltage monitoring + cleaning)
20-year total cost of ownership (TCO)	Medium (medium purchase + low maintenance)	Lower (low purchase + medium maintenance)	High (low purchase + short life requiring multiple replacements)







B2B key conclusion: tubular batteries cost about 1.5-2x more upfront than AGM flat plate, but last 2x+ longer, and 20-year TCO is 30-40% lower than AGM.

• §12 Chisen OPzS2-420 Float Voltage Setting and Temperature Compensation Formula

Chisen OPzS2-420 standard float voltage is 2.24V/cell (25°C), and requires float temperature compensation of -3.3mV/°C/cell.

V_float (actual temperature) = 2.24V + (-3.3mV/°C) × (actual temperature - 25°C)




Ambient temperature	Calculation formula	Compensated float voltage
25°C (reference)	2.24V (no compensation)	2.24V
15°C	2.24 + (-3.3mV × -10)	2.27V
35°C	2.24 + (-3.3mV × 10)	2.21V
45°C	2.24 + (-3.3mV × 20)	2.17V
55°C	2.24 + (-3.3mV × 30)	2.14V







Cycle charging voltage (instead of equalize): 2.35-2.40V/cell (@25°C) with -5mV/°C/cell compensation, max current 20A. Purpose: cyclic operation (PV standalone, periodic applications).

Float voltage accuracy requirement: ±1% (±25mV); exceeding this range significantly shortens battery life.

Float current: < 5mA/Ah (Chisen spec), i.e., a 420Ah battery float current < 500mA.

• §13 Chisen OPzS2-420 Operating Temperature Range (Discharge / Charge / Storage)

Chisen OPzS2-420 operating temperature by scenario (spec sheet classification): discharge -40°C ~ 60°C, charge -30°C ~ 55°C (charging stricter than discharging), storage -25°C ~ 45°C. Optimal operating temperature 25°C (rated capacity definition point).

Effect of temperature on capacity (OPzS spec sheet Capacity Affected by Temp precise table, 10HR capacity):




Ambient temperature	Capacity (10HR)	Application recommendation
40°C	108%	Slight capacity increase at high temperature (flooded electrolyte ion activity more intense)
25°C	100%	Rated capacity reference (design life 20 years)
0°C	85%	Capacity reduced 15% at low temperature
-15°C	65%	Capacity reduced 35% at extreme low temperature (electrolyte viscosity increases)







OPzS flooded batteries have a float life of 20 years at the standard 25°C temperature; float life halves for every 10°C temperature rise (Arrhenius law). That is, 35°C ≈ 10 years / 45°C ≈ 5 years. Flooded batteries are more temperature-sensitive than OPzV valve-regulated (accelerated electrolyte evaporation).

High-altitude usage requirements (GB/T 19638): ≤ 3000m normal use without special treatment; > 3000m, capacity derated 8% per 1000m elevation; extreme high altitude (> 5000m) requires special customization (low-pressure sealing + reinforced container).

Temperature-compensated float voltage requirement: 25°C = 2.24V/cell / -3.3mV/°C/cell. Charging stages additionally use -5mV/°C compensation.

• §14 Chisen OPzS2-420 Self-discharge Rate and Storage Conditions

Chisen OPzS2-420 self-discharge rate is 3%/month (CHISEN spec sheet measured value, stored fully charged at 20°C — note: the industry commonly uses 25°C as reference, the spec sheet uses 20°C).

Self-discharge characteristic curve by storage temperature (CHISEN spec sheet Self Discharge Characteristics measured):




Storage temperature	After 6 months	After 12 months	After 18 months	After 24 months
	remaining capacity	remaining capacity	remaining capacity	remaining capacity
10°C	about 90%	about 82%	about 75%	about 68%
20°C	about 82%	about 70%	refill required	refill required
30°C	about 65%	refill required	refill required	refill required
40°C	about 48%	refill required	refill required	refill required







Storable duration by storage temperature (without recharging): at 20°C can be stored 1 year (OPzV) / 9-12 months (OPzS) with 65-75% remaining capacity; at 25°C stored 1 year (OPzV) / 9-12 months (OPzS); at 35°C only 6-9 months before recharging needed, remaining 60-70%; at 45°C only 3 months before recharging needed, remaining 55-65%; at 15°C 18-24 months without recharging, remaining 65%+; at extreme cold -20°C can be stored 24+ months without recharging.

Storage recommendations: store fully charged in -25°C ~ 45°C dry, ventilated environment, avoid direct sunlight, organic solvents, and corrosive gases. Perform a boost charge every 3-6 months (constant voltage 2.27V/cell (OPzV) / 2.24V/cell (OPzS) for 24 hours). Batteries stored over 12 months must undergo a capacity test before recommissioning.

• §15 Chisen OPzS2-420 Max Charging Current and Discharge End Voltage

Chisen OPzS2-420 recommended max charging current: 84A (max allowed, spec measured).

Charging parameter recommendation table (IEC 60896 + GB/T 19638):




Charging stage	Voltage (25°C)	Current limit	Application scenario
Float	2.25-2.27V/cell (OPzV) / 2.24V/cell (OPzS)	< 5mA/Ah (≈0.5A)	Backup power / float standby
Equalize	2.30-2.35V/cell (OPzV) / 2.35-2.40V/cell (OPzS)	≤ 0.25C10 A	Once a month / lagging cell recharge
Cycle charge	2.35-2.40V/cell	≤ 0.20C10 A	PV energy storage / deep cycle
Boost (solar)	2.35V±0.005V/cell	≤ 0.20C10 A	Solar/wind energy storage (emergency charging)







Charging temperature compensation: charging voltage follows float voltage, with -3.3mV/°C/cell compensation (float / equalize with independent -5mV/°C/cell compensation).

Charge termination judgment: the battery is considered fully charged when charging current drops below 0.5% C10.




Discharge current I(A)	End voltage Vpc	Application scenario
I < 0.05C	≥ 1.90Vpc	Very small current long-term discharge (backup monitoring)
0.05C ≤ I < 0.08C	≥ 1.85Vpc	Small current float backup
0.08C ≤ I < 0.2C	≥ 1.80Vpc	10HR standard discharge
0.2C ≤ I < 0.6C	≥ 1.75Vpc	5HR medium current discharge
0.6C ≤ I < 1.0C	≥ 1.70Vpc	1HR high current discharge
1.0C ≤ I < 2.0C	≥ 1.60Vpc	High power pulse discharge







• §16 Chisen OPzS2-420 OEM / ODM One-Stop Customization

Chisen OPzS2-420 supports OEM / ODM one-stop customization services. All customizations do not affect standard specification performance.

Container color customization

Custom ABS container by customer Pantone color code (standard gray-white + red/blue/green/yellow/orange + customer-specified color)

LOGO silkscreen printing

Customer LOGO printed on the container (no language limit, any language can be customized)

Laser marking

Laser marking on the side of the battery cover (model / serial number / production date / customer code / barcode)

Color box / neutral box packaging

Standard color box + neutral outer box, customizable Logo / color / barcode / anti-counterfeit label

Label customization

Battery label typeset per customer requirements (no language limit, any language can be customized)

Terminal replacement

Φ16-M6 / Φ20-M8 / Φ24-M10 three options (standard Φ20-M8)

Terminal seal upgrade

Standard + triple seal structure + explosion-proof acid filter (OPzS with optional acid-proof vent)

Third-party test reports

Optional SGS / TUV / BV pre-shipment inspection + full IEC 60896 test report

MOQ and lead time data: sample order from 1 unit (inquire by email); small batch 24 units (24V system 12 cells + 12 spare) / 48 units (48V system 24 cells + 24 spare); large batch 200+ units (multiple voltage combinations with full OEM customization). Specific lead time + warranty details, please see the contact info at the end.

• §17 Chisen OPzS2-420 FAQ — 25 Engineer-Reviewed Questions

Chisen OPzS2-420 FAQ (25 items). Each covers the most frequently asked high-frequency questions by industrial field engineers, spanning technical parameters, sizing, ordering, shipping, and after-sales.

OPzS2-420 float voltage setting?

Standard float voltage 2.24V/cell @25°C, must apply temperature compensation -3.3mV/°C/cell (IEC 60896-11).

OPzS2-420 cycle life?

1500-2500 cycles (80% DOD, 25°C), float standby life 20-25 years. The tubular positive plate design is the core advantage (1.5-2x higher than flat plate AGM).

OPzS2-420 operating temperature range?

-40~60°C discharge / -30~55°C charge / -25~45°C storage (optimal 25°C). Flooded type has better low-temperature performance than valve-regulated (higher low-temperature capacity retention).

OPzS2-420 self-discharge rate?

3%/month (CHISEN spec sheet measured, stored fully charged at 20°C), can be stored 9-12 months without recharging. Flooded batteries have slightly higher self-discharge than valve-regulated due to sulfuric acid evaporation.

OPzS2-420 battery type?

Tubular flooded vented lead-acid battery, tubular positive plate structure, liquid dilute sulfuric acid electrolyte, open vent plug design.

Difference between OPzS2-420 and OPzV2-100?

OPzS is flooded open type requiring periodic refilling (every 3-6 months), vertical installation preferred; OPzV is GEL valve-regulated maintenance-free (vertical/horizontal/side installation, not inverted). OPzV has higher short-circuit current (1700A vs 3500A), OPzS has slightly lower internal resistance (0.001 vs 0.0011 Ohm), OPzS is cheaper (mature process).

OPzS2-420 internal resistance?

About 0.56 mΩ fully charged (25°C), short-circuit current about 3500A.

OPzS2-420 charging method?

Recommended constant voltage constant current (CC-CV), float 2.24V / equalize 2.30-2.35V / cycle 2.35-2.40V. Max charging current 84A.

OPzS2-420 storage conditions?

-25°C ~ 45°C dry, ventilated environment, avoid electrolyte leakage or freezing. Store fully charged recommended.

Which national standards apply to OPzS2-420?

See §4 for the applicable standards list (6+ international / regional / industry standards).

OPzS2-420 weight?

), incl. electrolyte / excl. electrolyte as needed; excl. packaging / excl. terminals.

OPzS2-420 dimensions?

Length Length 145mm × width 206mm × height 525mm (CHISEN spec sheet measured, incl. terminals).

OPzS2-420 terminal torque?

10-12 N·m (Φ20-M8 bolt terminal).

OPzS2-420 short-circuit current?

About 3500A (25°C fully charged), meeting large UPS short-circuit protection requirements.

OPzS2-420 float design life?

20-25 years (25°C float voltage 2.24V, temperature compensation -3.3mV/°C).

How to choose between OPzS2-420 and AGM flat plate?

Tubular positive plate lasts longer (1500+ cycles vs 500-1000 cycles), suitable for long-term projects / critical backup; AGM flat plate is cheaper, suitable for short-term / budget-sensitive. Refer to §11 TCO chapter.

OPzS2-420 installation orientation?

Must be installed vertically (to avoid electrolyte leakage), not suitable for confined cabinet spaces. Recommend a dedicated battery cabinet or rack.

OPzS2-420 refilling frequency?

Refill every 3-6 months (depending on ambient temperature + charging voltage). Use deionized water or distilled water.

Is OPzS2-420 capacity affected by temperature?

40°C = 108% / 25°C = 100% / 0°C = 85% / -15°C = 65% capacity (10HR discharge rate).

Which documents are needed for exporting OPzS2-420?

Standard documents: packing list + commercial invoice + CO certificate of origin + MSDS + UN2794 transport appraisal. Destination-country special certifications (SONCAP / PVOC / SASO / BIS / ESMA) can be assisted on demand.

OPzS2-420 MOQ?

Sample 1 unit / 24V system 12 cells / 48V system 24 cells / 110V system 54 cells / 220V system 108 cells. Bulk 200+ units enjoy wholesale pricing.

OPzS2-420 lead time?

Please email sales@chisen.cn for quotation (lead time evaluated by quantity + destination country + expected delivery date).

OPzS2-420 warranty?

24-month basic warranty (from installation and commissioning). Extendable to 36 months negotiable at bidding.

Does OPzS2-420 support OEM customization?

Yes, OEM/ODM one-stop customization: container color, LOGO silkscreen, laser marking, color box packaging, label customization, terminal replacement. MOQ 50-100 units.

Does the OPzS2-420 price include shipping?

EXW factory price; sea freight quoted by destination port (FOB/CIF/DDP optional). Please contact sales@chisen.cn for quotation.

• §18 Chisen OPzS2-420 Daily Use and Maintenance Recommendations (Engineer Practical Guide)

Chisen OPzS2-420 daily use + maintenance recommendations (engineer practical guide). Following these specifications can significantly extend battery life to 20+ years:

1. Charger selection: must use an industrial-grade smart charger (with pulse desulfation function, matching 12V/24V/48V system voltage); float 2.24V/cell (25°C) + temperature compensation -3.3mV/°C/cell; equalize 2.35-2.40V/cell (once a month, < 24h); max charging current 84A (per PDF spec sheet measured value, use with current limiting) to avoid high-current impact on plates.

2. Installation environment: battery cabinet / rack installation, off the ground ≥ 100mm (moisture protection), off the wall ≥ 50mm (heat dissipation); operating temperature -40°C ~ 60°C (discharge) / -30°C ~ 55°C (charge); forced ventilation cooling required above 45°C; altitude > 3000m, capacity derated 8% per 1000m (GB/T 19638); keep away from heat sources + direct sunlight + corrosive gases.

3. Routine inspection (weekly / monthly for remote sites): check terminal connection torque 10-12 N·m, no looseness / oxidation / overheating (infrared temperature measurement); container inspection for bulging / leakage / cracks (OPzS flooded, normally no leakage, but check liquid level); cell voltage deviation < ±0.05V (enter equalize state if exceeded); container temperature vs ambient difference < 5°C (check connections / charging if exceeded); check electrolyte level and specific gravity every 3-6 months.

4. Long-term storage specifications: store fully charged at -25°C ~ 45°C dry, ventilated environment (avoid direct sunlight); boost charge every 3-6 months (constant voltage 2.24V/cell × 24h); self-discharge rate 3%/month (25°C), capacity test required before reuse if not charged for 9-12 months; batteries stored over 2 years are recommended for derated use.

5. Troubleshooting: capacity drop > 20% (vs nominal) — equalize charge 24h to repair, replace if ineffective; abnormal float voltage (> 2.4V or < 2.2V/cell) — check charger + temperature compensation; bulging / leakage / odor — stop use immediately, contact CHISEN after-sales; short circuit / reverse connection — check fuse + polarity marking (red positive, black negative); electrolyte specific gravity < 1.20 — add distilled water.

6. Activation of first-use / long-term idle batteries: factory new batteries — first check electrolyte level + specific gravity, add distilled water to the standard level if necessary; batteries idle over 6 months: first discharge at 0.05C small current to 1.80V/cell, then charge per normal charging curve; series banks (48V / 110V / 220V) require "cell matching equalization" before commissioning to ensure cell voltage deviation < 0.05V.

7. Safety precautions: avoid metal tools touching both positive and negative terminals simultaneously (short-circuit current 3500A is lethal); no open flames in charging areas (lead-acid battery charging produces hydrogen, explosion risk with open flame); wear goggles + acid-resistant gloves (electrolyte contains dilute sulfuric acid; flush eyes with clean water for 15 minutes and seek medical attention if splashed); dispose of end-of-life batteries per UN2794 dangerous goods procedures (do not disassemble or spill electrolyte).

• §19 CHISEN Factory Strength + Global Service System (Why Choose Chisen)

CHISEN factory + global service system (why choose Chisen).

1. Factory scale: CHISEN brand established 2002, 20+ years specializing in tubular batteries; 200+ model complete product line covering 2V / 6V / 8V / 12V all voltage levels, capacity 4Ah-3000Ah; mainstream models in stock 100,000+ units (immediate shipment).

2. Global service network: export experience to 60+ countries (China / Southeast Asia / Europe / Africa / Middle East / Latin America / Central Asia / Oceania); industrial projects in telecommunications / power / data centers / PV / railway; 7×24 multilingual technical support (English / Chinese / Spanish / French / Arabic / Russian / Vietnamese); 12h email response / 24h complete quotation / 48h complex project proposal.

3. Quality control: certifications applied per customer requirements (certification items determined by customer); 100% factory inspection before shipment (capacity test + internal resistance test + voltage test + appearance inspection); SPC statistical process control on key processes (plate pasting / group assembly / formation / sealing); cooperation with SGS / TUV / BV / CTI third-party pre-shipment inspection per customer requirements.

4. Export support: first-hand customs documents (commercial invoice / packing list / CO certificate of origin / MSDS / UN2794 transport appraisal / full IEC 60896 test report); multilingual technical documentation (EN / CN / ES / FR / AR / RU); assistance with destination-country special certifications on demand: SONCAP (Nigeria) / PVOC (Kenya) / SASO (Saudi Arabia) / BIS (India) / ESMA (UAE).

5. Long-term cooperation policy: dedicated technical liaison for long-term customers; OEM strategic partners can share sales leads + training support.

6. Sustainability commitment: lead-acid batteries are recyclable; certifications applied per customer requirements (certification items determined by customer); EU RoHS / REACH / WEEE compliance (unrestricted exports to Europe).

• §20 Chisen OPzS2-420 Contact — Reply within 24 Hours

[CHISEN Battery] 20+ years specializing in tubular battery exports / validated by customers in 60+ countries.

Contact methods:

1. Email inquiry: sales@chisen.cn (complete quotation + sizing proposal within 24h)

2. Phone / WhatsApp: +86 131 6622 6999

3. Website: https://www.chisen.cn