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Panasonicappropriate service offered by your service provider/telephone company. .... Feature.KX-TGA641C. KX-TGA740C. KX-TGA840C. Handset. Display colour/ size ..... "Fran?ais" as the display language. .... This feature allows you to put an outside.
Remove the telephone from it's base; then remove the battery cover; disconnect the battery.
With the battery disconnected, press the power button on the telephone to fully discharge it.
Wait 2 minutes to be certain the telephone is fully discharged, then reconnect the battery and replace it on the base.
This will get you to the point that you can go out and purchase a replacement battery for these panasonic cordless telephones.
I couldn't find the exact manual for your phone but I would try to re-register the phone. Following are some instructions for similar models of your phone.
*To do this on a non-expandable cordless phone:
Press and hold the LOCATOR/INTERCOM button on the Base until a beep sounds.
Press and hold the FLASH/CALL WAIT button on the Handset until a beep is heard.
When registration is complete, a beep sounds from the handset.
Wait for 20 seconds after registration is complete to allow the handset to establish communications with the base.
If this fails to help: Remove the AC Adapter from the phone base or wall outlet for a few seconds and reconnect. It may also be necessary to remove the battery from the handset for a brief moment. Good luck!