I got a Dewalt 36v pack and tore it down into two 3s and two 2s packs. Fantastic cells! I didn't even have to solder anything except the wires together. Just had to cut a couple battery bars, which are quite thick compared to the ones used in cheap NiMh packs (radioshack, powerizer, tenergy, etc). They haven't given me any heat problems on my Mamba 5700 Rusty:yipi. Considering I got them for $7.50 per cell makes them a heck of a deal!
The only problems they do give me is lack of tire glue
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Brijar!!!