Picture a lovely spring afternoon where you leave your house with 6 fully charged LiPo batteries, ready to fly your tiny quadcopter through the neighborhood… Or better yet, in an unpopulated open field. After you have your fun, you then get home and plug a battery into the charger, change it and charge, change it and charge, over and over and over. More than likely you will forget about it before all your cells are charged, crippling your next flying opportunity.
If that sounds familiar, then something like this E2650 LiPo Battery Gang Charger would work quite well. It includes six separate charge cables that can simultaneously pump 100 or 500mA into your batteries as needed. You just plug everything in, and it does the work for you, with a trickle charge preconditioning, followed by a 4.2V charging cycle. So even without the 6 at a time ability, this is certainly an upgrade over the straight to USB connector that likely came with your little quadcopter and its battery.
