LiPos Should only be charged through their balance plug. These are some of the most cost effective balance chargers available. Plug and play, once all the charging lights turn green, your LiPo pack is fully charged. These chargers charge only 7.4v and 11.1v LiPo packs. 
Do not plug in the battery backwards, this can break your charger. Just line the bumps on top of the plug up with the grooves on the port of the charger. Please pinch all the wires equally at the base of the plug when removing the plug from the charger port.