I ran a K2 LiFePO4 battery I got from FoxOne all last season. My glider really only has room for a PS1270 size battery unless I want to do some extensive fabrication and the LiFePO4 battery fits right into my Walter Dittel battery box. I figured I would need some extra capacity as last year I installed a PowerFLARM core, LXNav Flarmview 57 and LX8080/V5 combo while keeping my Dittel FSG-50. The ship got a couple of pounds lighter, the battery is easier to install - it has to be installed through the control hookup access hatch on the fuselage of my ASW-15 - because of the lighter weight and the battery lasts longer than the 1270 size 9A/H unit it replaced. I kept flying to the beginning of November and there was no noticeable impact on performance due to the cold.