SimplyGo Mini DC Power Supply Overview The DC Power Supply will safely charge a battery that is in the concentrator while the unit is connected to DC power, even if the unit is not operating. Note: DC power provided by the DC Power Supply will also charge the battery when the device is turned off or is running on setting 1, 2, or 3. It may not charge the battery when the device is running on setting 4 or 5. Charging status can be verified with the battery icon on the Home Screen.