Rechargeable batteries are batteries that can be restored to full charge by the application of electrical energy. They come in many different designs using different chemistry. They are also called storage battery or secondary cell. Attempting to recharge non-rechargeable batteries may lead to a battery explosion. Additionally, one must be careful to recharge a rechargeable battery before it is completely discharged, or Reverse Charging may occur.
In the order of improving energy per weight ratios there are:
See also: fuel cell, trickle charging
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