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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.

4 votes

What is this white stuff inside this circuit board?

Generally this is a silicone elastomer which as mentioned helps to keep large components in place or closely spaced components from touching.
Nick Hebner's user avatar