![]() ![]() ![]() Naturally, the loaded voltage still has to be higher than battery voltage. In the case of small, non-regulated chargers, the voltage supplied by the transformers will drop considerably once it has to actually supply any real current to a load, so while it may read 18 volts disconnected, it will drop to a lower level when it is connected and working. There are other considerations, such as the current flow and thermal buildup, but at it's basic level, you need a voltage greater than battery level to charge the battery. To charge a battery, one must force electricity to flow 'into' the battery, which simplified, means that you need to apply a higher voltage to the battery.
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