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

Update on Monday, May 23, 2005 at 07:58PM by Blake Robertson

I ultimately just decieded to use CR2032 mainly because of familiarity.  I already had libraries created for them and we already kept these in stock in our lab.

The other big reason for using this battery is there was enough space and didn’t want the batteries to always need to be replaced.