Panasonic KX-TGM420 Operating Instructions Manual page 196

5
Insert batteries.
• The batteries are started to be charged.
Note:
• If the message counter is still on when you release
the keys, the base unit is not in the charging only
mode. Repeat from step 1.

To deactivate the charge only mode:
– Press any key.
– 24 hours passed after activating the charge only
mode.
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