[kenkamm]

I run a E-Revo with an Align 600XL and Align 75A ESC and 8S1P A123s, and the thing is nuts. I put the long wheelbase rear suspension arms on it and lowered the ride height to the lowest setting on the arms, and this thing lights up all four road rage tires from a stop, and hits 45 MPH at top end. The A123 cell seems like the ideal application for this kind of thing. It's tough, safe, and no timers or low voltage issues. Sure, the voltage drops under load... but my answer to that is, add another cell. They can discharge at 70A continuous and 120A peak (for up to 10 seconds.) I buy the dewalt packs on ebay (about $100 for 10 cells), and make whatever I need from them. Each cell has tabs on it, which are plenty robust enough for soldering to, and you don't risk heating the cell (certain cell death.) I use a TP-1010C and 210V balancer, to keep tabs on cell health. I charge them as fast as I can and they don't complain. At that voltage the 1010 maxes out at 6A charge rate, so the charge is quick enough to keep me happy.