The X-Caliber Battery Charge Adapters allow you to charge an X-Caliber Li-Po battery with a Thunder Power type charger. The adapter converts the balance connector with 2.54mm (0.100") spacing to a plug with 2mm (0.079") spacing. This balance connector adapter is designed to be used with 3-cell Li-Po batteries with a 4-pin balance connector. The adapter will also work with any of the following battery types to allow them to be charged with a Thunder Power style charger: Great Planes, Horizon Hobby, Dualsky, Esky, Align, Dynam, 3E, Battery Hobby, Radical RC, Common Sense (new style V2 series), DN Power, Hi Model, Yuntong, Turborix, Hexcell, Tenergy and others with the same style connector. These adapters can also be used to replace a damaged balance connector on a Thunder Power battery bu cutting off the X-caliber socket and attaching the bare leads to your battery. Innov8tive Designs