The was an operator who checked into the Sunday Night net who suggested using the following batteries for a go kit. I thought I would pass this information along. Check out the following website: https://www.hobbyking.com/hobbyking/store/__14074__ZIPPY_Flightmax_8400mAh_4S2P_30C_LiFePo4_Pack.html -- Dan Metcalf -- KB3UUN c. 301 769 1111