Agreed, multicell lipo packs should be balanced.

Some balancing schemes work in conjuction with a Lipo charger, others work independenty as stand alone charger/balancers. Others will balance a pack by discharging each cell to the level of the lowest cell prior to charging, these will also limit the charge to each cell so that it does not exceed 4.2 volts. The balancing issue is addressed in a number of different ways. The simplest is to measure each cell voltage and then charge them individually. No balancer is required, only your regular lipo charger set for single cell charge.