I'm not sure that I would recommend these packs anymore. I bought 8 of them at their original release, 4 for me, and 2 for 2 friends. While at first they were very powerful, their longevity left something to be desired. Though we all pushed them very hard, at roughly 50 cycles they are down to taking only 5500 mah. They also tend to come out of balance. However, SMC did give me a discount on a pair of new packs, that I am waiting on, as they say the newest cells are better. I have 3 mos to try to push them to their limit, so I will report back once I know something.
But I did just get a new pair of the SPC 8000's. They seem to be doing very good. I really need to get the SMC's for a good head to head comparison.