OpenROV/openrov-software — pull request #311 by thunderstorm99 (2014-10-22 17:10:30+00:00)
Title: Added LiFePO4 batteries & set as default

Added LiFePO4 batteries and set them as default. Voltages taken from this site: http://www.powerstream.com/LLLF.htm
Lower boundary set a little higher (2.2V rather than 2.0V) in order to have a safety gap.