[MetalMan]

You would only balance the cells in series, unless it is 2 3s packs put in parallel. But if it is 3 groups of 2 parallel cells, that are then put in series, then it would be fine. IE, if 2 cells in parallel, they will always remain in balance with each other because they have to remain at the same voltage. The only downside is that if one cell goes bad between these 2, then the other will go down with it (this has happened to me with 2 different packs).