This is a G4 1.2 iBook running 10.5.8. I've tried the PRAM and PMU procedures repeatedly without impact. Here are my battery specifics before I describe the problem:
Battery Information:
Charge Information:
Charge remaining (mAh): 3125
Charging: Yes
Full charge capacity (mAh): 4267
Health Information:
Cycle count: 3072
Condition: Good
Battery Installed: Yes
Amperage (mA): 1433
Voltage (mV): 12243
I'm using a replacement battery and adaptor but until a few months ago everything was normal until the battery stopped charging after a maximum of 9% addition. In other words, I could go from 12 to 21% then charging stopped even if the adaptor is still plugged in. If I remove the battery and put it back after waiting 15 seconds or more, charging restores and I'm good for another 7-9%. Repeat procedure, toward 100% or close enough. The iBook worked fine on battery power other than the countdown strangely stalling at 5% remaining, where it will sit for an extraordinarily long time before showing the Low Battery warning and then quickly konking out.
Since the iBook is no longer our primary computer I let the situation exist until it got noticeably worse. Sometimes I'd have to take out and replace the battery several times before charging resumed toward another 7-9%. Finally charging stopped -- period -- with the battery drained completely.
The iBook would sporadically recgnize the adaptor. I'd be running fine then the computer would quit in a flash, sometimes going to sleep while typically requiring a restart. Only if I twisted and moved the adaptor plug would the iBook eventually ackowledge the cable and allow the startup procedure, often quitting in midstream.
Last week I purchased a new adaptor and sent away for a replacement (used) DC-in board. The adaptor was an improvement, recognized by the iBook. But I still couldn't charge the battery. This afternoon I replaced the DC-in board. For a few minutes it appeared everything was wonderful until charging stopped at exactly 9%. So I'm back to familiar ground, no different than a few weeks ago with the original DC-in board. I've amused myself by taking out the battery and gaining another 7-9%, now up to 77% as I type this.
Does anyone have any ideas or similar experience? Obviously the DC-in board was an issue since my situation changed markedly today when it was replaced. But perhaps it's not the sole problem. I guess it's possible the used DC-in board that I purchased cheap on eBay was in similar declining condition to my original one, despite "Tests OK," and now I'm stuck in the same predicament as the past few months.
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