Polaroid PDC 3000 - Manual (Page 211)

Maintenance and troubleshooting 211
To charge the batteries while they are in the camera, connect
the power adapter/trickle charger to the camera and to AC
power.
07.CDR
Charge the batteries completely by leaving the charger
connected to the camera for about 6 hours (12 hours for new
batteries). You can use the camera while the batteries are
charging.
Note: Connecting the camera to the computer and using the
viewfinder mode while the batteries are charging may extend
the time necessary for completely charging the batteries.
Charging the batteries
in the camera