Not knocking Thunder Power as they seem to be the best trusted name on the market. However, for those like me who are worried about price, I opted for the best price I could find on Lipos anywhere. Dymond Motorsports sells lipos at roughly half the price of other brand names. I picked up 3 cell 10c 2000ma packs at $35 a piece. Now, I've read a few horror stories on Dymond lipos but haven't had any trouble with mine. Use them to power a Stryker with the BP21 brushless motor. Even had one pack that was already near dead spend two days in a tree. It's voltage was below 3.5 volts but it wasn't bloated so I decided to try to charge it using extreme caution. Since the voltage was below the allowed voltage for my Celectra lipo charger, I charged it a few minutes on a nihm charger at 1 amp. Once the voltage was high enough for the lipo charger to accept I gave it a regular charge. Pack is fine now with no bloating or loss in capacity. Generaly happy with the quality of the wrap and wires as well and the dead charge tells me they can take some abuse. WARNING: Doing what I did above could very easily result in a fire or explosion. I charged mine in my driveway away from anything and wore goggles when going near them. If I had the extra money to blow and wanted a good solid brand name I'd buy the Thunder Powers. However, in real life sometimes you have to go on the cheap.