Panasonic NV- MS1 Series Operating Instructions Manual page 14

The Charging Indicator will go out about 90 minutes after
charging starts. However, the Battery Pack should be charged at
least 3 hours for extended use.
-14-
To charge the Battery Pack connected to the AC Adaptor
Use the Battery Pack Charging Connector provided with the AC
Adaptor.
@ Standby Socket
'ON"
Battery Pack Charging
Socket
@ Connect
Battery Pack Bottoly pack
charging connector
elt is possible to charge two battery packs simultaneously—one
connected to the AC Adaptor and another inserted in the S-VHS
Movie. However, charging them at the same time takes twice as
long as charging them separately.