Hey there. I run A123 cells in a saddle configuration in my bj4we. I am just running 2S1P and it lasts for an entire 6 minute main no problems. This is mod though. I have a 2s1p in stock, and it is a bit slow, but not bad though, I have won quite a few races even though I am a little slower down the straight. I am using a FMA balancepro charger to charge them.