Unable to Calibrate Battery or Install Battery Updater

I think I have a problem with my internal battery on my Aluminium Powerbook G4 as when I charge my battery up and then let is discharge to follow the calibration procedure I get the warning that the powerbook will go into sleep mode and then when it should go into its reserve sleep it just shutsdown.
I have to plug the adapter in and press the power button. When the powerbook has booted I get the date & time reset to 1970 !
I am only getting less than a hour out of my battery so I am thinking thats on its way out and I will probably get a replacement but I wanted to at least calibrate it first to check.
If the internal battery is shot can it be replaced and has anyone actually done this procedure ?
I have also tried to run the powerbook G4 battery updater however I can not get past the message "Your power adapter must be plugged in You must have a 65W power adapter plugged into a working power source during the update process". The power adapter is plugged in, the battery is charging I have tried it in multiple plug sockets and even at different locations but no joy. When I look at the system profiler under power the AC charger information is showing up at 50watts am I missing something ? I have tried my friends adapter and that shows at 50W as well !
I have reset the PMU and also PRAM however these dont seem to have done anything.
If anyone could shed any light on any of these matters I would be truly gratefull.

Given your date and time is constant resetting that normally indicates a dead internal PRAM battery. Try leaving your PowerBook connected to power for around 24 hours to see it it changes anything. It's quite possible that you problems will go away if you were able to get this battery working or replaced it. You would be surprised as to how much havoc this little battery can cause.
As for your main battery, have you tried it in your friend's PowerBook to see if it behaves like it does in your PowerBook? If you have then you might want to.
As for the power adapter, it should be showing 45W or 65W. Apple have never made a 50W adapter for the PowerBook G4s. Can you confirm that you have a 65W adapter? It will say that somewhere on the adapter so if it doesn't you're not using a 65W adapter.

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