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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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Safe Discharge Rate of Alkaline Batteries

I see that "D" Alkaline Batteries are rated for 1.2-1.5v and 12,000mAh. So I am looking at using a 3 "D" Alkaline Battery Pack to achieve the 3.6v-4.5v supply. … But, I have not been able to find anything on the maximum safe discharge rate of Alkaline Batteries. …
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