This is a tiny LiPo power pack, perfect for the low power MSP430 micro-controllers. If the battery is used as a standalone, make sure you have an LDO or regulator to get the volatage down to 3.3V. The Booster BoosterPack is a compatible LiPo charger, which doubles up as a  power pack, so your projects can be made standalone.

Capacity:500mAh

Size: 1.73in x 0.98in x 0.27in

​Voltage:3.7V

Continuous discharge rate: 15C

Burst Rate : 30C