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A step up from the CR2032

A step up from the CR2032

A step up from the CR2032

(OP)
So as you may know, most CR2032s are shy of 250 mAh. I'm fine with their size and voltage, but I want something with a capacity of at least 300 mAh while still keeping it under 3 grams.

Does anyone here have experience with really lightweight batteries like this? I'd like to stick with LiMnO2 chemistry but am I just hoping for the impossible?

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