i have always had a hard time keeping the cells balanced as well , so much for matching cells.......

anyway i needed one cell once , bad pack and wanted to rebuild, and was told that i couldnt just put one cell in because the cells are matched and it wont stay balanced......it never did from the get go , but the pack is going strong, as long as i dont discharge below 3.3vpc


they have some new hard case packs coming out from what i here , but for the price i will look elsewhere for packs , imho