Under normal circumstances, as long as the charger can be charged after being plugged in, it is considered normal if it automatically "changes the light" after being fully charged. However, if the quality of the charger is unqualified or the charging setting parameters drift after a period of use, it will cause undercharge or overcharge.
1. When we suspect that the charger has an insufficient charging failure, we can first use it to charge to the "changing light" state, and then continue to charge with a normal charger. If the charging can continue, it can be determined that there is an insufficient charging failure.
2. When we suspect that the charger has an overcharging failure, we can first charge it with a normal charger to the "changing light" state, and then use the charger that may have a problem to continue charging. If the charger can continue to charge for a long time, the charger exists Overcharge failure.
