My powerbook G4 has stopped recognising the battery, why might this be and what can I do?

Hi There, after knock my powerbook g4 has stopped recognising the battery, why might this be and what might I do?

What does "after knock my powerbook..." mean? Did it fall on the floor or ?
First, reset the PMU. That can often fix power-related glitches. If that doesn't do it, you can try a PRAM reset:
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
If one of those two steps doesn't change anything, do you have another working battery you can substitute?

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