This is the Battery charger for the version 3 battery for the X-Treme™ TrailMaker, TrailClimber, XB-300Li and XB-305Li Electric Bicycle. Please see battery description if you have questions whether or not this is the battery charger you need. You can also call our Customer Service Department for assistance as well. If you need a charger for the X-Cursion or XB-310Li Folding Mountain Bicycle, please see part #XCUR-250-1.