I picked up a 3s2p from the ohmygod guy on ebay . I think they are the "fake" a123 cells packs . I guess it doesnt matter as they work great . It is 4600 mah pack and charges to 4550 consistantly from full discharge and balances perfectly . Being able to use a safer battery at the track and only needing one is pretty cool as it can be charged up at absurd high rates in about 10 minutes.
Performance is outstanding as well. The batteries are bigger and bulkier but not heavier than a 7 cell nihm and fit in a flat battery tray easily with velcro straps.