The battery pack is a Dualsky XPower. I bought a couple as spare batteries for my Storm Launcher Hydroplane. To use them I have to make some alterations to the Storm Launcher and it's charger. I have Deans plugs for the plane, so just trying to track down these balance charger plugs to wire into the charger (the battery that comes with the Storm Launcher has kid friendly docking system for its own battery).

Neither of those sites seem to have quite what I want. This is the closest that they have:

http://robotbirds.com/catalog/product_info.php?cPath=9_96&products_id=1244