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Battery Choice

I ruled out pretty much all other batteries but lithium coins because they’re so small, cheep, and didn’t want to include a recharger circuit on board. 

So, the choice mainly comes down to using a 12mm, 20mm or 24mm coin.

12.5mm Coins:
CR1220 has a 35mAh capacity and costs $0.95

20mm Coins:
CR2016 has a 90mAh capacity and costs $0.30
CR2032 has a 220mAh capacity and costs $0.30

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