Ibook G4 - battery isn't charged while computer is off or on standby

Bought myself a new battery for ibook G4 (14 inch, 2004) because it's still working quite alright.
Problem is that even if battery is completely unloaded (3%), it isn't recharged when switched off or when it is on standby. Whereas there is no such problem when ibook is switched on and on duty. Any idea?

Try PMU PRAM reset.
http://support.apple.com/kb/ht1431

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