Panasonic TY-EW3D3LE Operating Instructions Manual page 12

The battery does not charge, or operation time is
short when charged.
► Is the charging cable connected properly?
Make sure the charging cable is properly connected.
► Is the television power off?
Switch the television power on, then charging will start.
► The battery has reached the end of its lifespan.
If operation time is very short even when the battery is charged, the
battery has reached the end of its lifespan. Please consult with the
place of purchase.
12