Dead PB Battery causing system operation issues ??

Hi, I bought a 1Ghz DVI Titantum G4 on Craigslist over the weekend. The system has what appears to be a completely dead PB battery that is 5+ years old (there is writing on the back of the battery "May 2005").
It came with a 3rd party 45W adapter/charger and the system will run from that just fine.
Mac OSX 10.4.11 says the battery is charged at 96%, but when I try to run the PB from the battery, nothing happens. I press the little button on the bottom of the battery and it indicates a fully charged battery. However the System Profiler shows no amperage from the battery on the power portion of the profiler. I checked the PRAM battery with a multimeter and it still has a charge.
Will leaving this apparently dead PB battery in the system cause other operational issues ? Any thoughts ?
Thanks

Keeping a dead battery in the computer won't cause any problems, but the fact that it's dead will, of course, mean it won't serve to prevent certain kinds of problems that wouldn't arise if it were a good battery.
In particular, you probably won't be able to unplug the AC adapter and transport the Powerbook for more than a handful of minutes before the PRAM battery is completely drained, and then the drained PRAM battery may prevent the machine from starting up until it is recharged — which will go very slowly if a dead main battery is in place and the computer is trying in vain to recharge that too. The main battery gets charging priority, and the PRAM battery gets charged after the main battery is full. If the main battery never charges, the PRAM battery may not either, unless the main battery is removed.
It's also true that in the event of an AC power outage while you're working, the dead battery won't fulfill its usual function as an uninterruptible power supply. The computer will instantly shut down, and whatever you're working on that hasn't been saved will be irrevocably lost. If the battery were good, you might not even notice the outage.
If the computer is just going to sit on a desk and be permanently connected to AC power, you can leave the dead battery in it — except after a power outage, when you'll need to remove it for 5-6 hours to give the PRAM battery time to recharge in its absence. On the other hand, the only real reason to keep a dead battery in the machine is to prevent foreign matter or objects from getting inside the battery compartment. There's no other advantage to having it in there.

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