Panasonic KX-HN4001 Operating Instructions Manual page 29

Battery recharge
Problem
The monitor unit beeps
and is displayed.
The battery is not fully
charged.
For assistance, please visit http://shop.panasonic.com/support
Cause & Solution
R Battery charge is low. Fully charge the battery (page 14).
R The temperature for the charging conditions is too low or too
high. Charge the battery within the specified charging condition
range (page 30).
R The battery may not be installed. Install the battery (page 14).
R The battery may be deteriorated. Please visit
http://shop.panasonic.com/support
Useful Information
29