Truck, I’m still using the good ole four cell 2400mah NiCads from NOBS Batteries. They are performing exceptionally well in my 50cc 20 pound planes. With a little math I come up with a current consumption of 500ma to 600ma as the steady state average. Using the higher value, I need 900mah for the 90 minutes I fly each time at the field. With a two to one safety I use the 2400’s from NOBS. They are easy to charge, discharge and monitor. However, sometimes when I grab my aileron servos at the end of the day their torque is reduced. I’m sure it’s caused by the connector drops and line loss although I have 20 gauge extensions. If I up the cell count I’ll be increasing the current draw. That’s where the LiFe batteries idea came from. Right now, the easiest thing to do is to use aileron servos that will operate at the lower voltage and I have them. Dan.