Frank, it's Sean from Delta-I was talking to you about your DNX408 on Sat, wore the AKA hat/shirt. I run the Protek LiFe 1450 packs. Got two of em. They both work great. You can easily run a full day on them without charging. Fully charged voltage is 7.2V-not as high as LiPo, but LiFe has way better discharge characteristics, i.e. it doesn't puff up or swell at low voltages like LiPos do. I doubt anyone could tell a difference in servo performance from a LiPo to a LiFe. Give em a shot, they seem to work well for me. Nice meeting you Sat, ur Durango looked sweet...I'm tempted to jump from the Mugen...later.