1) Whether the battery suffers from external short circuit or over discharge, reverse charging (reverse the positive and negative terminals of the battery or the positive and negative terminals of the charger, the battery is equivalent to forced over discharge when charging); whether the electrical circuit is normal; There are signs of burnt.
2) Whether the battery is continuously overcharged by high-rate and high-current, causing the battery movement to expand, and the internal positive and negative electrodes are directly in contact with the short circuit.
1) Understand the specific use of the customer's battery;
2) After the same type of battery is charged, the appliance is connected to determine whether the appliance is normal;
3) Charge the battery for 1 minute at 1C current, and leave it open for about 10 minutes. If the open circuit voltage of the battery is stable within the normal voltage range of the battery, the battery can basically return to normal. If the battery has been damaged, the voltage cannot be recovered. If the battery does not use this phenomenon, the 1C charging voltage cannot be recovered, and it needs further analysis by professional technicians.
4) Customers can be advised to use batteries with protection electronic components such as fuses and temperature switches or integrated circuits (disconnect the circuit in the case of over-current charging and discharging, short-circuiting, overcharging, over-discharging, and reverse charging, thereby protecting the battery from damage).
5) It is recommended that the customer pay attention to the spot welding current and the distance between the solder pins.