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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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How can I parallel a battery supply and AC supply?

for this first of all please tell us if load is AC or DC. for DC you need to rectify AC into DC and bring the rectified AC's output DC voltage to DC battery's voltage level and connect them in parall …
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