A tetherless workstation is provided having a rechargeable battery power supply installed therein for supplying electrical power to equipment associated with the workstation. The battery power supply includes a diagnostics interface for monitoring an indication of at least the battery charge level and for outputting that indication together with a unique identifier stored within the power supply for transmission over a wireless communications interface. A monitoring apparatus is also provided to monitor the operational status of tetherless workstations using indications output by their respective power supplies, for logging usage of workstations and for generating reports on their operational status, including predictions relating to their operational status.