Batteries to use with Lilypad Arduino

The important spec for batteries is their mAh rating.  mAh stands for milli Amp hours & tells you how much energy is in each battery.  A typical LilyPad project requires approximately 30 milli Amps (or mA) continuously.  To estimate how long each battery will last for a LilyPad project divide the mAh rating by 30.

Polymer Lithium Ion Batteries – 100mAh

Description: This is a very small, extremely light weight batty based on the new Polymer Lithium Ion chemistry. This is the highest energy density currently in production. Each cells outputs a nominal 3.7V at 100mAh!

$6.95 Available via Sparkfun