This is the Castle Creations Parallel Battery Wire Harness with Deans Plugs. FEATURES: Connects two battery packs in parallel, enabling capacity (mAh) to be doubled while the voltage stays the same 10 gauge wires RoHS compliant YOU WILL RECEIVE: Parallel Battery Wire Harness with two Deans Male Ultra Plugs and one Deans Ultra Female Plug SPECIFICATIONS: Length: 5.5" (140mm) not including connectors COMMENTS: Always use identically prepared packs with this harness. Both packs must be fully charged and properly balanced. Both packs must be made by the same manufacturer, have the same C rating, same number of cells, and both must have the same capacity. Failure to observe this warning will result in battery damage. jxs 01/04/09 ir/jxs &