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Here's Why Lithium AA Batteries "Fail" Out of the Blue (And What to Do About It)AA batteries are usually in the 1.2V to 1.5V range, depending on the exact battery chemistry. For example, Nickel-Cadmium ...
It contains two Sanyo 2100mAh NiMH AA rechargeables (Model HR-3U 1.2V). In addition to that, there is an Atmel microcontroller (not pictured) and the copper temperature probe you can see above.
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