Overcharging of Ni-MH batteries will heat up again, which is related to the length of time for overcharging. There have been people who caused the Ni-MH Battery's liquid exploding or leaking due to overshoot. 2. If the Ni-MH battery is overcharged, the battery performance will be reduced, the capacity will be reduced, the life span will be shortened, and even be laid off soon. 3. The charging time of the Ni-MH battery is indicated on the plastic cover of the battery. There is no problem within 1 hour of overcharging.