Would this work?

[Jasper]

I started with two, 6 cell GP3300 peak powerflo P/M packs. After a few runs I want more power and I put at each pack one cell. I discharged the 6 cell pack by driving and after that I put the pack on an robitronic discharge equilizer to makte them the same voltage. The extra cell was allready discharged. I soldered it together and charged it at 3A with 8MV/cell. All the cells were after charging the same temperature. The output of power was also higher.