Uniden Radio - Manual (Page 11)

8
Battery Backup
Battery backup capability allows the WX500 to operate for a limited time
when AC power is not available. During AC power loss, all radio features
are available, but turning the Emergency/Weather Radio OFF will
conserve the battery. Remove the battery if the WX500 will not be
plugged in for an extended period of time. Without AC or Battery Backup
power, the Clock time will be lost, but all other programmed information
will be kept.
WX500 will sound a Low Battery tone at the time that a low battery
condition is detected. After the tone, the Low Battery Icon will turn
ON to indicate that the Backup Battery needs replacement.
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