I have the 0610i and I found the builtin balancer to be too much of a PITA to use so I just charge directly throuth the output jacks of the charger into the pack, I balance either before or after using an external balancer, and contrary to what people think Lipo technology is not dangerous, I have never had a pack even get warm on me, I suppose there is a possibilty that a pack could catch fire or blow up, but there is also a possibilty that while baking cookies in a gas oven that could blow up also.....