Originally Posted by locked

http://www.roarracing.com/?cat=26

in a subsection of the battery approval process update, dated Thursday, May 26th, 2011

"8.3.2.5.5 Batteries must be charged with chargers that have balance ports, using only the balance mode for charging, or an acceptable alternative demonstrated to the satisfaction of the President and/or Technical Director. Charging without balance mode and without a balancing harness is not permitted. Simply connecting the harness and not using the balance mode is cause for disqualification. Only 1S 1P batteries may be charged without balancing, as it’s only one cell. Any packs consisting of 2P and/or 2S will require balanced charging or approved alternatives.

Balance charging ensures that each cell within the pack charges individually to full capacity. Non-balanced charging may inadvertently overcharge one cell, and undercharge the other. Under these conditions, the risk for battery failure is greater, or at least you will suffer from reduced performance."