Opps wrong site. I knew I saw it some place.
http://www.oople.com/rc/photos/reviewtrakpowerlipo/
With only two cells, and superior technology,
balancing the cells, I'm told, isn’t as critical or necessary
as with previous types of cells. The TrakPower pack is matched (both cells are selected for their similar performances to eliminate differences due to manufacturing tolerances) but it is however good practice every now and then to make sure things are equal. Trakpower have recently released their own balancer / equalizer, which automatically keeps the balance in check.