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1) Whether the battery has been subjected to external short circuits, overdischarging, or reverse charging (reversing the positive and negative terminals of the battery or charger, which is equivalent to forced overdischarging during battery charging); Is the electrical circuit functioning properly; Is there any burnt mark on the spot welded battery.
2) Whether the battery is continuously overcharged by high rate and high current, causing the battery core to expand and the internal positive and negative poles to directly contact and short-circuit.
Handling method:
1) Understand the specific usage of customers' batteries;
2) Charge batteries of the same model and connect them to electrical appliances to determine if they are functioning properly;
3) Charge the battery with 1C current for 30 minutes and leave it open for about 10 minutes. If the open circuit voltage of the battery stabilizes within the normal voltage range, the battery can be basically restored to normal. If the battery has been damaged, the voltage cannot be restored; If this phenomenon occurs when the battery is not in use and cannot be restored with a 1C charging voltage, further analysis by professional technicians is required.
4) Customers can be advised to choose batteries with protective electronic components or integrated circuits such as fuses and temperature switches (to disconnect the circuit in case of overcurrent charging and discharging, short circuit, overcharging, overdischarging, or reverse charging, in order to protect the battery from damage).
5) Suggest customers pay attention to the spot welding current and the distance between the welding pins.

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