If the battery power is not working for some reason, the storage cannot be opened. You can then connect an external power supply via the plug-in input with a powerbank. The kit includes a Powerbank, Connection cable and a Battery End function card. This card changes the locks behavior. Instead of automatically opening of the lock at Battery end, the storage remains closed with this function card. the alternative Battery end function is only compatible withl ocks 2.0. Buy this kit or only a seperate Connection cable.