RE: Lipo Balancer, how does it work??
well it all depends on the sink ratio of the balancer vs the capacity of the pack vs the charge rate vs how much the pack is out of balance
for example if you had a balancer that sunk 120mA of current, and a pack that was 1200mAh, and a charge rate of 1.2A or 1C, then you would be looking at up to 120mAh of extra current, or up to 110% charge on that pack because it is a 1 hour charge, if it was a 2 hour charge it could be up to 20%. I find that my balancer sinks about 1/2 of what it's rated at, so on avergage in 1 hour it sinks 60mA, and it is capable of 120mA
All in all what richrd said is right. They work on a CC CV and the capacity in amps is more of a failsafe mechanism rather than a charge termination mechanism