Pete, we now have 18 flights on a 75# Super Decathlon. I'm using redundant 4600 mah 2 cell A123 battery packs for the receiver and a 2300 mah A123 pack for the ignition. These are excellent batteries and I highly recommend them. I'm using a Hughes RC Spectra 4 to charge them. One very nice trait is that the internal leakage, self discharge, is extremely low. They can be charged a week or more before you go fly. No need to keep being concerned.