a123 or lipo.... and other ?s

[starscream]

I'm not sure what you mean by a "flat" pack. Are you referring to the A123 3S packs?

I am testing a prototype 3S flat pack from modelelectronicscorp.com (same size as the 4S pack)
I am running 7S on my maxcim system and am happy with the the initial results. I charged them in series using my Lipodapter and Astroflight 110D. The funny thing is that the 110D cuts off the charge before the LipoDapter.
I am going to really put them to the test this weekend when I head down to the track so I'll have a better idea on actual track results then.

I really don't know why anyone would want to solder these cells together.
The Solderless Power Tubes are, IMHO, the best way to go. The M1 cells stay in balance very well so using a balancer on every charge is really over kill and not necessary IMO.