me chargers could effectively prevent overcharge of batteries by switching the charge cycle from fast mode to trickle mode when the charger detected the abrupt change of voltage and other parameters.

Some chargers could prevent overcharging batteries by switching the charge cycle from fast mode to trickle mode after a predetermined time.

The strength of the output voltage is depended on the major input and the loading rate.

The power supplies have constant output voltage regardless of the load and mains supply’s deviation.