Summary of EV battery problems.

1. Unbalance.

Due to the difference of capacity and voltage. It is often a serious laggard.

Repair method: replace it, but do not use a new one.

2. Loss of water.

Caused by overcharging. Reasons for unbalance and charger.

Repair method: add water (distilled water).

3. Vulcanization.

Caused by under-charge. Reasons for water loss and charger.

Repair method: use 0.01-0.02C small pulse current.

4. Soften.

Caused by high current charging and discharging.

Repair method: first discharge deeply, and then charge with 0.2-0.5C large pulse current.

5. Fall off.

Later stage is inevitable.

Repair method: None.

6. Short circuit, open circuit.

Due to serious vulcanization and peeling, it is inevitable in later life.