I have alot of batteries from all-battery, and they have been used over the course of a year and a half and still perform very well. They are tenergy cells and i have heard several people bash them, but i dont listen because i know first hand that they have been nothing but great. I ran my 1/10 AWD rally cars yesterday and they went for a good 20 minutes of consistant power delivery and i charged one up later and it took 2800 mah. BTW i radared my 1/10 scale Lancer AWD with stock 540 can motor and a 7 cell and it radared at 37 mph, i was very impressed. Here are some packs to consider:

http://www.all-battery.com/72v4200ma...rctraxxas.aspx

http://www.all-battery.com/tenergypr...onnectors.aspx

If anyone is interested here are the packs i was using yesterday and are over a year old, (and got the 37 mph pass on a stock can 540 motor)

http://www.all-battery.com/84v3800ma...forrccars.aspx

I charge them with a NIMH charger, i store them in room temp, i cycle them once every couple months.............basically i take proper care of them, the folks with the bad experiences most likely over/undercharge them, dont discharge or cycle them and leave them plugged in to the esc for 2 weeks.................etc. Oh, and the intelligent comments towards the tenergy cells were like - "Tenergy sux" etc............