Just got an email from Mike(from Big E-RC) and my A123 packs are ready to be shipped. :D :D It's going to be two 8s5p packs in series (16s5p, 80 cells total) to make 52.5v 11.5ah.
I'll be using this to charge them:
http://shop.vendio.com/evan2002/item/818330695/index.html
It should take...