1. Overcharge protection
2. Over discharge protection
3. Overcurrent and short circuit protection
The solution after the mobile phone battery starts protection (from the network):
1. Use the original direct charge to charge the mobile phone directly, and the protection circuit of the battery protection board will be automatically opened.
2. Short-circuit the positive and negative electrodes of the battery in an instant, and see that there are sparks on the electrode pads, try a few more times, and then use the direct charge to charge.
3. Find a 5V DC power supply, touch the positive and negative poles of the battery with the positive and negative poles, try several times, and then use the original charger to charge.
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