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Can you jump a 6 volt battery with 12 battery?

It is not recommended to jump a 6-volt battery with a 12-volt battery because it can cause damage to the smaller battery. The 12-volt battery can provide too much voltage and overcharge the 6-volt battery, leading to potential hazards such as overheating, leakage, or even an explosion. If you need to jump-start a 6-volt battery, it is safer to use another 6-volt battery or a proper step-down converter designed for this purpose.