The Jazzy Select Elite and Jazzy Elite 6 Battery Charger is compatible with models with serial numbers beginning with JB3. It is an offboard charger that fully charges the batteries in 8-14 hours. Just position your chair in front of a wall outlet, turn the controller off and engage the freewheel mode, plug the charger cord into the wall outlet and the other cord into the socket on the controller. A LED light will change colors when the batteries are fully charged.