Question 1

There is corrosion or white crystallization on the terminals. How to fix it?

Accepted Answer

The white crystals are usually sulfates, caused by poor terminal contact, gassing during charge or persistent damp. Disconnect power, clean with warm water and a little baking soda, dry thoroughly, apply petroleum jelly or terminal protectant, and check bolt torque and seals.

Question 2

The battery case is bulging. What should I do?

Accepted Answer

Bulging is usually caused by overcharging, excessive charge voltage, a blocked safety valve or an internal short. It is irreversible and a safety risk. Stop using it immediately, isolate it, and send photos with your usage and charge parameters. We will assess it under the warranty terms.

Question 3

Is reduced capacity and hard starting in winter normal?

Accepted Answer

Yes. Lead-acid capacity drops about 20 percent at 0 degrees Celsius and about 50 percent at minus 18 degrees, while higher oil viscosity increases cranking resistance. Check the charging system before winter, keep the battery fully charged and choose a higher CCA model.

Question 4

The battery cannot recover after a deep discharge. What can be done?

Accepted Answer

If open-circuit voltage falls below 10.5V on a 12V unit and remains there for over 30 days, irreversible sulfation is likely. Try a low-current recovery charge at 0.05C for 24 to 48 hours; if capacity remains below 80 percent, replacement is advised. Fit low-voltage protection to avoid discharging below 50 percent depth of discharge.

Question 5

How should the charge voltage and current be set?

Accepted Answer

General guidance: charge current at 0.1C to 0.2C, cycle charge voltage 14.4 to 14.8V and float 13.5 to 13.8V for 12V maintenance-free, with temperature compensation of about 3mV per cell per degree Celsius away from 25. For series strings, multiply the per-unit voltage by the number of units.

Question 6

Is significant heating during charging normal?

Accepted Answer

Slight warming is normal, but a noticeably hot case above 45 degrees Celsius is abnormal, usually caused by excessive charge voltage or current, an internal short or high ambient temperature. Stop charging immediately and report the charge parameters and infrared temperature photos.

Question 7

The battery will not hold charge and runtime is short. What now?

Accepted Answer

Common causes are sulfation from chronic undercharging, excessive depth of discharge, low charge voltage settings or an internal short in one unit. Please provide charge parameters, discharge current and measured runtime so we can determine whether it is a usage or quality issue.

Question 8

The battery will not accept charge. What should I do?

Accepted Answer

Check in order: charger output voltage, reversed polarity, whether open-circuit voltage is too low and has triggered protection, oxidized or loose terminals, and ambient temperature below 0 degrees Celsius. Deeply discharged batteries should first be revived with a low-current recovery charge.

Question 9

Is a low voltage on arrival normal?

Accepted Answer

Maintenance-free batteries ship fully charged, so a 12V unit should read above 12.6V open-circuit and a 2V cell above 2.10V. Readings below 12.4V may result from long transit or storage. Please record and report them and we will guide recharge or handle under warranty.

Question 10

What if batteries arrive damaged or leaking?

Accepted Answer

Do not touch the electrolyte directly. Isolate the damaged units and wear protective gloves and goggles, then take photos and videos including packaging, carton marks, damage and serial numbers, and contact us within 48 hours. Neutralize spills with baking soda and never pour them into drains.

Question 11

How should batteries be maintained during long-term storage? How often do they need recharging?

Accepted Answer

Store in a dry, ventilated, light-proof environment; lead-acid batteries have high self-discharge, so they must be recharged to full every 1-2 months; long-term storage in a discharged state causes permanent sulfation and scrapping, which is not covered by warranty.

Question 12

What are the common failure symptoms of the batteries?

Accepted Answer

Capacity decline, low terminal voltage, inability to charge, swollen case, and acid leakage/corrosion; zero voltage is usually caused by broken terminal welding or an internal open circuit.

Question 13

Which inverters are supported?

Accepted Answer

Most mainstream solar inverters are supported; please contact us to confirm specific models.

Question 14

Are they maintenance-free batteries?

Accepted Answer

Yes, our VRLA AGM/GEL sealed batteries require no maintenance under normal use.

Question 15

Is this model compatible with my vehicle/equipment?

Accepted Answer

Please provide the equipment/vehicle model, photos and nameplate of the original battery, installation dimensions, voltage, terminal type, capacity or CCA/discharge rate, operating temperature, and charging system parameters.

Question 16

What are the requirements for choosing a charger?

Accepted Answer

AGM/GEL batteries must use the corresponding lead-acid-specific charger; lithium battery chargers cannot be used. Float voltage must match the battery type.

Question 17

Can batteries be connected in series or parallel? What should I watch out for?

Accepted Answer

Series and parallel connections are possible, using batteries of the same batch and capacity together; an equalizing charge protection is recommended; do not mix old and new batteries, as a single lagging cell can damage the whole string.

Question 18

What is the minimum MOQ?

Accepted Answer

Standard stock items: low MOQ, a few dozen pcs; customized models: from 500 pcs; large project orders are negotiable.

Question 19

Do you support OEM/ODM? Can you print the customer's logo, customize packaging, and change terminals?

Accepted Answer

Yes. Logo printing, color box customization, and terminal type (threaded / tab) can all be customized; customization generally requires MOQ >= 500 pcs.

Question 20

Can they be used for solar energy storage, UPS, or electric vehicles?

Accepted Answer

Yes. GEL is recommended for off-grid photovoltaic energy storage; AGM is suitable for UPS, security systems, and telecom base stations; traction-type lead-acid batteries fit electric two-wheelers and three-wheelers.

Question 21

What is the battery operating temperature range?

Accepted Answer

Discharge: -15C to 40C; charge: 0C to 40C; storage: -15C to 40C. Low temperatures reduce discharge capacity.

Question 22

What applications are they suitable for?

Accepted Answer

They are widely used in solar power systems, UPS, telecommunications, RVs, golf carts, backup power, and energy storage systems.

Question 23

Does the price include terminals, bolts and manuals?

Accepted Answer

The standard quotation includes terminal covers, mounting bolts and a bilingual user manual. Special terminals, handles or tool kits can be quoted separately.

Question 24

What lead-acid battery certifications do you have?

Accepted Answer

We hold CE, RoHS and ISO 9001 / 14001 / 45001, and our products comply with IEC 60896, IEC 60095, EN 50342 and JIS D 5301.

Question 25

Which battery should I choose for a solar storage system?

Accepted Answer

We recommend GEL or tubular GEL deep-cycle batteries for their tolerance to deep discharge and high temperature and their longer cycle life. AGM deep-cycle is a lower-cost option. Please also advise system voltage, daily discharge and days of autonomy so we can size the bank.

Question 26

Do the battery sizes comply with JIS, DIN or EN standards?

Accepted Answer

Yes. Our batteries are produced to JIS D 5301, DIN and EN 50342 standards, and we can provide a full dimension chart and case drawings so you can check installation space and hold-down position.

Question 27

What is the self-discharge rate?

Accepted Answer

Maintenance-free batteries self-discharge about 3 percent per month at 25 degrees Celsius, and higher temperatures accelerate it noticeably. We recommend recharging every 3 months in stock, and we recheck open-circuit voltage before shipment.

Question 28

What is the cycle life?

Accepted Answer

Our deep-cycle series delivers about 400 to 1200 cycles at 50% depth of discharge and 25 degrees Celsius. Stationary types have a design float life of 10 to 15 years. SLI batteries are rated by cranking cycles and float life rather than cycle count.

Question 29

What capacity and voltage options do you offer?

Accepted Answer

Common options are 12V from 4Ah to 250Ah, 6V from 4Ah to 225Ah and 2V from 200Ah to 3000Ah. Capacity can be rated at C20, C10 or C5, so please specify the required rate before ordering.

Question 30

Do you have 2V tubular GEL batteries for large-scale storage?

Accepted Answer

Yes. Our 2V tubular GEL (OPzV) series ranges from 200 to 3000Ah with a design float life of over 15 years, suitable for telecom base stations, substations, data centers and large storage projects.

Question 31

Do you have deep-cycle batteries for solar storage?

Accepted Answer

Yes. Our deep-cycle range includes AGM and GEL types supporting 400 to 1200 cycles at 50% depth of discharge, suitable for solar storage, RV, marine and off-grid applications.

Question 32

What is the difference between AGM, GEL and standard lead-acid?

Accepted Answer

AGM uses glass-fiber mat separators absorbing the electrolyte, giving high cranking current and good value. GEL uses gelled electrolyte with better deep-discharge and high-temperature tolerance and longer cycle life, ideal for storage. Standard flooded is the lowest cost but needs maintenance.

Question 33

What is the difference between maintenance-free and flooded batteries?

Accepted Answer

Maintenance-free batteries use a sealed valve-regulated design requiring no water topping and produce almost no gas, and can be mounted in any orientation. Flooded batteries require periodic water level checks with distilled water but tolerate overcharging better and cost less.