KX-UDT111RU (serv.man3) - Panasonic PBX Service Manual (repair manual). Page 18

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After your Panasonic battery is fully charged (at 25 

°C ):

*1 When the "Talking" setting of "Backlight" is set to "Off".
*2 When the "Talking" setting of "Backlight" is set to "On".

• Operating time may be shorter than listed above depending on usage conditions and ambient temperature.
• The battery will drain slowly even while the handset is turned off.
• The handset can receive calls while charging.

• Battery consumption increases when the handset is out of range (if  "

" flashes, turn the handset off).

• Clean the handset and the charger contacts with a soft, dry cloth once a month. Clean more often if the unit is subject to grease,

dust or high humidity. Otherwise the batteries may not charge properly.

The battery need to be charged in the following situations:

• The battery level indicator displays as empty (“ 

 “) and the alarm sounds*1.

• "Charge Battery" is displayed. In this situation, the handset cannot be operated.

*1 If the low battery warning occurs during a conversation, the handset will turn off in a few minutes.

If the battery level indicator displays as empty  (" 

 ") after using the phone for a short time, even when the battery have been

fully charged, the battery should be replaced.
Before replacing the battery, make sure the low battery warning is displayed, then turn off the power to prevent memory loss.
Replace the battery and charge the new battery for about 7 hours.
If you replace the battery before the low battery warning appears, the battery strength icon may display an incorrect reading. 
In this case, use the handset as normal with the new battery installed. 
When the low battery warning is displayed, charge the battery for about 7 hours. The battery strength icon will then display the
correct reading.

• Please use AAA Ni-MH 1.2 V, 700 mAh batteries only. 
• There is a danger of explosion if the batteries are incorrectly replaced.

While Talking
(Backlight off *1, Narrowband Mode)

Up to about 11 h

While Talking
(Backlight on *2, Wideband Mode)

Up to about 8 h

While not in use
(Standby)

Up to about 200 h