How to correctly remove/install iBook battery plus battery problem

My iBook G4 (14 inch screen, late 2005 model) battery may need replacing. Lately when using only battery power, the computer has shut down suddenly when the power gets down somehere below 50%. If I were to get a new battery, what is the correct way to replace it? In the computer user's manual on p. 47 under "Using Your Battery" it says "If your battery runs low while you are working, attach your power adapter and let the battery recharge. If you want to replace the battery with a charged one, attach the power adapter, shut down your iBook, and replace the battery. If you replace the battery without the power adapter attached, you can lose information and settings such as the date and time." But on p. 48 under "Removing and Replacing the Battery" it says under To Remove the Battery: "Shut down your iBook. Disconnect the power adapter, phone card, and any other cables to the computer to prevent damaging the computer." Which is correct: leave the power adapter connected, or disconnect it? Thanks!
If anyone has any thoughts about what could be causing the shut downs when using battery power, that would also be helpful. I have mostly used the power adapter, letting the computer run on battery power occasionally. The system profiler says I have gone through only 15 cycles. I did calibrate the battery when I first got the computer.

Talked to Applecare on the phone and they also supported the idea of resetting the PMU, which I have now done. Restarted the computer and ran it off the battery the rest of the day. When it got below 50% the computer shut down once again. This time when I turned it back on the battery showed only 1% power! The previous times the battery would show 46% or whatever it was when it shut down. Then I turned off the computer, plugged in the AC power adapter, and let it charge overnight, but now 11 hours later, the battery indicator has gotten up to only 56% and will go no higher. The System Profiler says the battery is now not charging and indicates that the capacity is 3888 and the remaining capacity is 2180. It still shows 15 cycles, which is what it showed before. I guess I will be heading into the Apple Store soon. Any other thoughts before I do?

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