My computer shuts down after being unplugged

My powerbook G4 sometimes shuts down when I unplug it, even though the battery is fully charged. This seems to happen more often when I unplug it and then pick it up (or put it down). After I restart it, the clock and date have been reset to 1970.
Any ideas of what may be wrong?

Hi c,
Welcome to Apple Discussions.
How long does your PB run on the batt when it does not shut down after removing the power adapter? If a very short time, you may have a nearly dead batt, and the backup batt, even if it is still operational, only lasts a few minutes; once that is dead too, then date and time are reset.
I should have said this first, but just noticed that you said movement seems to cause the issue. That strongly suggests a loose battery. The "fix" can be as simple as wedging a thin piece of rubbery material between the battery compartment and the battery itself, on the side opposite the contacts, to make the contacts remain in contact at all times (earlier models had this issue, but it was supposedly fixed on later models, yet we still hear about it periodically).

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