This is an older pic. of my Revo, but you can see how I mounted the 5s2p setup:
http://img.photobucket.com/albums/v1...o/IMG_4940.jpg
Each set of 2 cells that are next to each other are in parallel, so the 5 parallel groups are in series.
You can get Dewalt 36v packs on Ebay for about $110 right now. You would also need the pack building equipment. The way I made my packs is something I came up with, and is a bit complex, so I don't know if you would want to build them that way or not.
A123 cells are very safe. They don't explode or burst into flames. I've read that when they die they merely heat up, without anything else happening to them.
SH Z-Car, Custom Crawler, 8s Savage,
12s XTM XLB 1/7 buggy,
4wd 4-link rear/IFS Pro4 truck,
Custom Hyper 10 Short Course,
Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz