Panasonic NV-DS11EN Operating Instructions Manual page 69

Charging the Built-in Lithiurn Battery
The built-in battery rnaintains the operation of the clock.
When the
[a]
Indication appears. the built-in lithiurn
battery is discharged. Charge the discharged battery in
the following way and after charging is finished, set the
date and time.
1
Connect the AC Adaptor to the Movie
Camera and to an AC mains socket.
(+ 16)
2
Leave the Movie Camera turned off.
3
Leave the Movie Camera in this condition
for approximately 4 hours.
After charging for 4 hours, the built-in lithium banery
can power the clock for approximately 3 months.