Kidde KN-COPP-3 Owner's Manual page 15

Installation
Upon initial power up or after the alarm has operated on
battery backup and depending on the charge state of the
battery, it could take up to 20 hours to FULLY charge the
battery.
During the first 10-hour initial charge period or, until the
battery has charged, "Lb" will be displayed along with the
CO level (usually "0") and without an audible "chirp".
When the initial charge is complete, the "Lb" will
disappear. If however, after 10 hours the battery is not
charging properly, "Lb" may continue to flash AND there
will be an audible "chirp" once every 15 seconds
indicating the battery is not charging. If this occurs, make
sure the connection between the battery and the alarm is
correctly oriented and fully seated. If not, disconnect the
battery and reconnect insuring the alignment ribs match
the slot in the battery. If it is properly connected and fully
seated and "Lb" is still displayed along with an audible
"chirp", contact customer service.
Battery Backup Operation
When the alarm is unplugged or loses AC power and the
battery pack is fully charged, the alarm will automatically
switch to battery backup operation and you will notice the
following:
• For the first five minutes of operation on battery, the
alarm will operate as if on AC power.
• However, after five minutes of operation, to conserve
battery capacity, the display will flash the CO level
(usually "0") once every 60 seconds.
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