why do AA & AAA rechargeable batteries run at 1.2V instead of 1.5V?
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It is a completely different chemical process which happens in them. And this produces very different voltages. And while alkaline batteries provide much lower voltage when empty, down to about .9V when completely out the reachargable Nickel-metal hydride batteries that can replace them maintain a voltage of about 1.2V throughout its discharge cycle.
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