Originally Posted by MRorange
If I dont ballance will it cause damage to the pack? And what happens when you ballance?
Lots of us take it for granted but the first thing to understand is that almost all batteries are made up of a group of cells. Due to manufaturing tolerances every cell is slightly differant. Even though they may be labeled 4000mah, that should just be the min. In reality they may range from 4000mah to 4200mah. Of course when charging, the higher capacity cell will take longer to charge and will cause the charger to over charge the other cell or cells. In most other battery styles (NiMH, NicD) the cells are tolerant of a slight overcharge but lipos are not.
manufacturers try to keep tolerances close and group cells together by capacity to keep the differance between cells small but at some point the cells will become out of balance (Not the same voltage) and everytime you charge and discharge it will do slight damage to the out of balance cell. In time that damage will get worse and cause a cell to fail. Lots of time they just puff up but if you don't catch the failure it can cause a fire.
The balancer serves 2 purposes.
1. It will terminate the charge if any one cell reaches to high a voltage (Over charges)
2. It will hold back or slightly discharge the cell that is higher in voltage keeping alll the cells "Balanced"
Hope some of this helps.