These are very slim, extremely light weight batteries based on Polymer Lithium Ion chemistry. Each cell outputs a nominal 3.7V at 850mAh. Comes terminated with a standard 2-pin JST connector - 2mm spacing between pins, that plugs directly into the battery connector on Altus Metrum flight computers.

Can be recharged with Altus Metrum Adjustable LiPo charger (not included)

Size: 6x30x48mm, weigh 19g

Note that while the battery is sold as 850mAh cells, the manufacturer varies their process from time to time, and batteries may be stamped 850mAh or 900mAh.

WARNING:  Unlike most LiPo batteries made for hobby use, these batteries are made specifically for use with Altus Metrum flight computers, and do not contain an over-current protection circuit board!