An automated data storage library with storage shelves, data storage drive(s), a bus bar; and a robot accessor with a drive system for moving the robot accessor, an accessor communication interface, a bus bar relay configured to engage and disengage the bus bar; a robot control configured to operate the drive system to move the robot accessor, to operate the picker, to operate the bus bar relay to engage the bus bar when the robot accessor is stationary; and a power storage system configured to receive power via the bus bar relay when the bus bar relay engages the bus bar, to store the received power, and to deliver the stored power to the robot accessor at least when the bus bar relay is disengaged.