The battery in the TomTom Bridge charges when you install the device in its dock and the dock is powered. You can also use a USB Home Charger.
You are warned when the battery level is low or critical. You lose your connection to the internet when the battery level is low or critical. When the battery is empty, the device goes into sleep mode.
Note: Charging your TomTom Bridge using your computer is not recommended. The voltage output of computer USB ports vary by manufacturer.