Panasonic HX-WA2A Owner's Manual page 186

About status indicator during charging
When the status indicator is flashing at a particularly fast or slow
rate, the following should be considered.
Flashing with approx. 4 second period (off for approx. 2 seconds,
on for approx. 2 seconds):
≥ When the battery is over discharged or the temperature of the battery
is too high or low. It can be charged, but it may take a few hours to
complete the charging normally.
≥ It will flash in 2 second intervals when normal charging resumes. Even
in such cases, it may start flashing in 4 second intervals until charging
is completed depending on the conditions of use.
Flashing with approx. 0.5 second period (off for approx.
0.25 second, on for approx. 0.25 second):
≥ The battery is not charged. Remove the battery from the unit, and try
charging again.
≥ Check that the terminals of the unit or battery are not dirty or covered
with a foreign object, and connect the battery correctly once again. If a
foreign object or dirt is present, turn off the unit before removing.
≥ The battery or environment is at an extremely high or low temperature.
Wait until the temperature has returned to an appropriate level and try
charging again. If you are still unable to charge, there may be a fault in
the unit, battery or AC adaptor.
Off:
≥ Charging has finished.
≥ If the status indicator stays off despite the charging being unfinished,
there may be a fault in the unit, battery or AC adaptor. Refer to page
184 for details on the battery.
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