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Generally whenever a low battery signal comes in that has a zone number with it, that indicates that there is a wireless sensor on that zone, that needs it's battery changed. Some panels will tell you at the keypad that there is a "Transmitter Low Battery", or "Zone Low Battery". This is quite different to panel batteries, since it is inside the sensor itself. The client may or may not be able to even open the sensor (Beware of tamper alarms). The sensor may use an odd type of battery, such as the one shown below.