Well my exp is getting a little limited these days.... Racing 10th scale I have had IP's which are good new and go average real quick, Chargery's which were better than IP's new and much longer life but also feel away badly after a while, some no name thing which was great for 1 min then soft afterwards (good practice pack) and then thunderpowers which are immense out of the packet and don't seem to lose anything after a year of racing. I was pretty amazed when a 2 week old pack produced less than 90% of its rated capacity. I have since been told that it was a poor batch and the newer stuff is considerably better but it is dissappointing none the less.