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You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > Mac Notebooks > Pb 12 Battery suddenly became useless

Pb 12 Battery suddenly became useless
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Tidzy Boo
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Join Date: Jan 2004
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Apr 17, 2004, 11:31 PM
 
I bought my Power book just over a year ago, i had noticed a bit of battery degredation over time, but suddenly my battery has become useless i cant disconnect it for more than 10 mins, with out it shutting down, oddly enough it doesn't even warn me im running on reserve power like it used to it just shuts down. And the adapter light stays amber to indicate charging for 20 mins or so, telling me that maybe the battery just refuses to charge to full potential.

anyway i have no idea help me!!!

-Tidzy Boo
     
Tomster
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Apr 17, 2004, 11:56 PM
 
Did you try reseting the PMU? Sounds like a corrupted power manager. Check Apple support for the exact procedure for reseting as they differ between Powerbook lines. Or, just tell us which Powerbook you have.
Happily using a Mac since '89
MacPortable: 16Mhz 1meg/40meg System 6.0.8 - 16lbs Yeah baby!
Powerbook 17" 1.33Ghz 2GB/100GB 8x Superdrive
Powerbook 12" 867Mhz 1.125GB/80GB 2xDVD-R RPC1
MacbookPro 17" 2.33Ghz
     
Tidzy Boo  (op)
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Apr 18, 2004, 11:48 PM
 
I have the 12 inch 867
     
Tomster
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Apr 18, 2004, 11:57 PM
 
1. If the computer is on, turn it off.
2. Reset the power manager by simultaneously pressing and then releasing Shift-Control-Option-power on the keyboard. Do not press the fn (Function) key while using this combination of keystrokes.
3. Wait 5 seconds.
4. Press the power button to restart the computer.
Happily using a Mac since '89
MacPortable: 16Mhz 1meg/40meg System 6.0.8 - 16lbs Yeah baby!
Powerbook 17" 1.33Ghz 2GB/100GB 8x Superdrive
Powerbook 12" 867Mhz 1.125GB/80GB 2xDVD-R RPC1
MacbookPro 17" 2.33Ghz
     
Tidzy Boo  (op)
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Apr 19, 2004, 04:45 PM
 
Good news
i reset the PMU and the battery's life has returned
how ever i wore to batt complety out and it still did not give me a warning that i was running on reserve power.
hrmmm.. weird!

anyways thanks to those who helped!

-Tidzy Boo
     
Tomster
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Apr 19, 2004, 04:58 PM
 
Glad to be of help. Sounds like you need to re-calibrate your battery.
Happily using a Mac since '89
MacPortable: 16Mhz 1meg/40meg System 6.0.8 - 16lbs Yeah baby!
Powerbook 17" 1.33Ghz 2GB/100GB 8x Superdrive
Powerbook 12" 867Mhz 1.125GB/80GB 2xDVD-R RPC1
MacbookPro 17" 2.33Ghz
     
   
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