Lifepo4 battery manufacturer Specialized in Energy Storage Battery since 2009.

New battery maintenance methods

by:dcfpower     2021-03-17

Regular use of battery products will have certain industry life standards, but if users learn new battery maintenance methods and adhere to the step-by-step implementation, the battery life will be longer and more efficient. The following is the battery maintenance method:

1. Dry-type rechargeable battery

The dry-type battery will discharge immediately after adding electrolyte. Before adding the charging solution, it is necessary to remove the stuffing tape, and then add the electrolyte to the normal liquid level. Use dilute sulfuric acid with a specific gravity of 1.240 (20°C) or the accompanying liquid as the electrolyte. After adding electrolyte, never put the tape back on the plug.

2. Battery discharge

The discharge voltage is as follows: the final voltage of the battery must not be lower than the following specifications

When the battery is discharged for about 10 hours, the current is every The unit is 80 volts.

When discharged for about 1 hour, the current is 60 volts per battery.

When the discharge current is high, each battery is 1.00 volts.

3. Initial charging of uncharged dry batteries.

(1) Use pure dilute sulfuric acid solution when adding electrolyte, with specific gravity 1.22 and temperature below 35℃.

(2) After adding the dilute sulfuric acid solution, it should be left standing for 3 to 10 hours and the temperature has dropped to 35C before charging can be started. If the electrolyte level is not enough, it must be added to the minimum liquid level.

(3) Use the specified initial charging current to charge. When the temperature exceeds 45C during charging, stop charging or reduce the charging current to prevent the temperature from rising. Extend the charging time when charging with 1/2 charging current.

(4) Continuous charging until the charging is completed. The battery will produce a large amount of gas and the battery voltage will rise to the maximum, the electrolyte specific gravity will rise to the specified value, that is, it will not rise for hours during continuous charging. The storage time after the factory produces the battery is the length of the charging time. Generally, the charging time is in the range of 50-80 hours.

(5) In the final stage of charging, adjust the electrolyte specific gravity to 1.240+-0.005 (temperature 20℃). Refer to the fifth paragraph for the electrolyte specific gravity.

4. How to charge the battery

The discharged battery should be charged as soon as possible.

A. Normal charging

aa. Constant current charging

bb. Two-stage charging

The charging current is at most greater than the normal charging current Charge 2~3 times. In any case, the charging current is always lower than the last

charging current. This method can be charged with a larger current than usual when charging is started. The normal charging current and time can be reduced according to the following methods:

(a) When the voltage of each battery is higher than 2.4V;

(b) When the electrolyte temperature is considered high At 45℃;

cc. Constant Voltage Charging

After adding resistance at the initial stage of charging, the charging current shall not exceed the specified maximum charging current, and keep each battery straight

The current voltage is 2.6~2.8V. In this way, you can consider using a larger current for charging in the initial stage of charging. At the end of charging, the charging current will automatically decrease, and the charging completion time is determined according to item d.

dd. Constant current and constant voltage charging

ee. Charging stop time

(a) Reach 110~125% ampere hour of rated discharge time, if so Know the discharge ampere hour.

(b) The final voltage shows the maximum value and remains unchanged for one hour.

(c) When the specific gravity of the electrolyte no longer rises and remains for more than one hour.

B. Floating charge

The voltage of each battery is 2.18V.

bb. When it is lower than 2.18V for a long time, it means that the specific gravity is gradually decreasing and it is in a state of need to charge. On the contrary, if the voltage is too high, it means that the life of the overcharged battery will be reduced.

C. Voltage equalization charging

Even if the battery is stored under normal conditions, it must be equalized charging once every three months. Battery charging can’t be ignored

When the battery is used for a long time waiting to be charged or the charging time is delayed.

Use constant current charging, where possible, use 1/2 normal charging current to charge. Measure once every 30 minutes until the battery voltage and specific gravity are kept constant after three measurements.

cc. The constant voltage charge is based on the voltage of each battery at 2.4V, and the charge is continuous for 8 hours.

5. How to add distilled water to the battery

Add distilled water to the specified height before equalizing charging. Electrolytic decomposition and natural evaporation during charging will reduce the electrolyte. Unless the electrolyte overflows, there is no need to add dilute sulfuric acid.

6. Adjust the specific gravity

If the electrolyte specific gravity differs too much, the specific gravity must be adjusted. Do not use dilute sulfuric acid to adjust the specific gravity before charging is completed.

If the specific gravity is too low, use equalizing charging to restore the specific gravity. If the specific gravity does not rise, use dilute sulfuric acid with a specific gravity of 1.40~1.45 to adjust.

There are two situations in which 5cc of distilled water or dilute sulfuric acid needs to be added to each Liter electrolyte, so that the specific gravity of each battery does not differ by 0.001. The adjustment of the final stage of charging must be continuously charged after addition to make it agitate and fully mix.

Measure the specific gravity at a temperature of 20℃. Use the following formula to convert the specific gravity at 20℃:


S20—specific gravity of electrolyte at -20℃

St—electrolyte specific gravity at ℃t

t—electrolyte temperature during measurement (degrees Celsius)

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