[BrianG]

You charge through the main red and black power wires (once you add your preferred connector) like any normal battery. The small connector with 5 wires in it is for balancing the pack so each cell is exactly the same voltage. You need a lipo capable charger like the Superbrain 989, Hyperion chargers, etc. And then, depending on the charger you get (the newer Hyperions have a built-in balancer), you might need to get a balancer unit.