Teltonika devices come with the internal backup battery disconnected (unless specially ordered), so before installation you must open the device and connect the battery. While the device casing is open, insert the SIM card you will use with your device. | Teltonika devices come with the internal backup battery disconnected (unless specially ordered), so before installation you must open the device and connect the battery. While the device casing is open, insert the SIM card you will use with your device. |