[highflier]

I heard the United hobbies cells are not as good as the A123's and since they are even more expensive why bother.

Yes you can build 5s1p packs then use a harness to convert them to either a 10s or 5s2p pack.

I went the 6s route. The A123's are slightly lower voltage then Lipo's so the 6s pack is more like a 5s lipo pack.

I use 3s packs and then harness them to a 6s pack. Nice thing is you can then zip charge them.

Zip charge = 10-15 min charge and no need to buy a charger just a coupel of bucks of parts :)

Highflier