A sensor's battery level is transmitted to OneVue during each check-in. When its battery life is less than 25% remaining, the sensor and its assigned Monitored Asset are set to an Alarm state with a Low Battery status.
You may have received an alert and noticed the sensor yellow LED indicator flashing and the low battery indicator displayed.
If you have already replaced its batteries, be sure to perform a manual check-in to clear its low battery status in OneVue. Press and quickly release its Check-in button 
(up arrow) .
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Acknowledge the alert to temporarily stop alert notifications.
From OneVue, go to the Dashboard > from the To Do list, select the alert > from the top section, add a comment indicating the action being taken and select Acknowledge.
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Replace the sensor batteries.
Open the sensor cover and remove its batteries.
Insert a 3.0v Primex Lithium/Iron Disulfide Battery Pack or two AA 1.5v Lithium batteries. Follow the symbols showing the correct way to position the positive (+) and negative (-) ends of the battery pack.
The use of alkaline batteries is not recommended.
Verify the battery switch is set to On (UP position) and replace the sensor cover.
If also operating on AC power, verify the power adapter is plugged in. The green LED is illuminated when powered by AC.
Press and release its Check-in button
(up arrow), which clears its Low Battery status in OneVue