This is a Replacement 24V UL LiFePo4 battery charger for the X-Treme™ X-Cursion & XB-310Li Mountain Electric Bicycle. Not compatible with LiMn batteries. If your unit was manufactured before 2011 it came equipped with a LiMn battery and you must purchase a LiMn battery charger (part #XB310-250-1).  You can easily upgrade your bicycle to a more reliable LiFePo4 battery system easily by purchasing the battery & charger.