The proprietary %XVBATLOWLVL command sets the battery voltage low level for a modem. If notifications of battery voltage low level have been subscribed to, the modem sends clients a notification when the measured battery voltage is below the defined level. The modem reads sensors periodically in connected mode. The default period is 60 seconds. If the temperature or voltage gets close to the set threshold, a shorter period is used. v1.1.x v1.2.x v1.3.x
The notifications are subscribed using the %XVBATLVL command.