A power system for a mobile workstation includes a docking station for a removable battery, a power bus, and a power interface having an output interface electrically connected with the power bus. The power system further includes a detector configured to detect user interaction with a removable battery docked with the docking station, and a switching device coupled with the detector and configured to switch the power interface from a first power sourcing mode to a second power sourcing mode receiving power from a back-up battery, in response to detecting user interaction with a removable battery docked with the docking station.