Polaroid PDC 3000 User Manual page 215

Note: The camera is not operable while the batteries are
removed, even if the power adapter/trickle charger is
connected. Furthermore, you may need to reset the camera's
date, time, default picture label and automatic shutoff
settings if the batteries are removed from the camera for more
than 30 minutes. For these reasons, you may want to
purchase additional "AA" NiCad batteries for use while
others are charging. (See Recommended battery types on
page 210.)
Maintenance and troubleshooting 215