ORIGINAL: flatspinjim
I agree with mstam1971. The A123's are hard to beat! Lots of amperage and you can charge them in 15 minutes. If the power box isn't in the plane, it can't fail.
Well through the charge receptacle the max is 4A charge, better to stay close to 3A.
With my next project, the EF Edge 540T, I'm going for the Wolverine switch with 2 A123 batteries. Both with 18AWG wire to the switch and a short 16AWG wire and one 22AWG wire for balance with a 3-pole mini Deans. The mini Deans is good for 10A so I can charge both batteries in less than 15 minutes. One 2-cell 1100mah A123 on the ignition is good for 9 15 minute flights, so combined with the 2 2300mah batteries, I can get 9 15 minute flights and have enough spare.