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An electric battery is a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy. Connected a battery's negative to another's positive is a way to increase voltage, useful when a battery outputs low voltage.

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Current output of a solar panel when connected to battery and load

First of all you need to be very careful when designing with Lithium-ion batteries. If you exceed their specified charge or discharge rates they can leak or explode, and nobody wants that! … You also need something to limit the discharge rate of the batteries. This can be a very simple circuit, but for safety you need something. …
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