[Espeefan]

The only LiPo packs I have run so far are from MaxAmps. Some people don't like them because they are expensive, but I have been very pleased with the ones I have. 5 now, in total. I recently bought 2 of their 3S 8,000 mili-amp packs and they have performed awesome. I've been getting at least 50 mins of runtime on my brushless powered 4x4 short course truck, running in short grass. I am sure it pulls more current than an excavator could ever pull, so a battery pack with that capacity should last you easily an hour or more.

I have some friends who also race trucks and they swear by Gens Ace battery packs. They are pretty affordable too. I also hear good things about Flight Power. Just a few others you could consider.