[MetalMan]

Just to add, here are some reasons why balancing is a good idea:
-A balanced pack will last longer
-A balanced pack will potentially be safer
Both of these are the way they are because when all cells are the same voltage, then there is no deviation. If an unbalanced 2s pack has one cell at 4.15v and the other at 4.25v, the cell at 4.25v will degrade faster than the cell at 4.15v (4.25v is pushing the cell further than it should be pushed). The cell at 4.15v will discharge to a lower voltage than the other cell (assuming both cells have the same capacity and IR). This too will cause damage to the cell (even if it's a small amount).