- match batteries sold by Spark Fun. Other vendors sell similar
- batteries for RC aircraft using mating connectors, however the
- polarity for those is generally reversed from the batteries used
- by Altus Metrum products. In particular, the Tenergy batteries
- supplied for use in Featherweight flight computers are not
- compatible with Altus Metrum flight computers or battery
- chargers. <emphasis>Check polarity before connecting any battery
- not purchased from Altus Metrum or Spark Fun.</emphasis>
+ match batteries sold by Spark Fun. These batteries are
+ single-cell Lithium Polymer batteries that nominally provide 3.7
+ volts. Other vendors sell similar batteries for RC aircraft
+ using mating connectors, however the polarity for those is
+ generally reversed from the batteries used by Altus Metrum
+ products. In particular, the Tenergy batteries supplied for use
+ in Featherweight flight computers are not compatible with Altus
+ Metrum flight computers or battery chargers. <emphasis>Check
+ polarity and voltage before connecting any battery not purchased
+ from Altus Metrum or Spark Fun.</emphasis>