Just be aware of the physical dimensions of 5000mAh+ batteries. NiMH packs use standard sized sub-C cells, but lipos come in all shapes and sizes. The high capacity packs are physically larger than the lower capacity packs, and won't necessarily fit in all vehicles. I got a pair of turnigy 5000mAh hardcase lipos for my evader, and was more than a little bummed out that they were a hair too tall to fit under the ESC shelf (which is part of the frame and cannot be adjusted).