Powerunity BikeTrax For Bosch Gen 4 ,Not Smart Only used for a Short time But Worked Very Well Has been Removed for a While So it is Possible Bzck up Battery Might Need Replacing ,This is charged when fitted to a E Bike and being Used A replacement is Not Very Rxspensive if it won’t charge up Best to get a Bike shop to fit it as they will have any thing Needed to Sort it out. Cost over £200
