Another place you will like to check out for a Balance/Charger all the way up to 6 cells is hobbyking.com and it charges your batteries in about a hour. It cost about $35 USD, also you can get good deals on good batteries. I personally have a Turnigy Balancer and Charger plus it contain a failsafe system that detect cells and batt overcharge. FYI is very important that all your battery cells are perfectly balance in other words each cells equal. ( normally in a 11.1v 3 cells is 4.2v in each cell for a total of 12.6v. ) Plus another thing once you feel the your battery is running low, land the heli, because if you keep flying it with a low battery you may ruin the battery.
One more thing the Esky charger the came in the box does not balance the batteries and that is bad for you battery and especially yourself and probably relatives... long story short a friend of mine did not have a balancer/charger and he was charging his battery in the kitchen ( do not charge battery inside your house neither leave it charging without supervision ) and he started hearing some noise coming out of the battery. Then the battery ( 6cells battery ) exploded and another explosion to a total of 5 explosions. Causing the entire kitchen to burn... lucky he had a fire extinguisher and put out the fire and now a new kitchen to fix. Pretty much what happened. 1 battery cell shorted out and the charger was still pushing current to the battery to reach it goal voltage of 22.2v causing overcharging the other cell and obliviously exploding.
Now I believe all or almost all balance/charger contain a failsafe system that auto shutoff if the battery is not work properly, like the incident I explained above.( My Turnigy does )
So definitely look forward to something like this for a charger.
That's Life ! ! !