PWG4 12 inches turn off without any warning still 47% bat

Hi
Is anyone have this problem before, whithout any warning my PBG4 12I turn off even if is still have power in battery 40 to 50%, The only way to turn it on is to plug it and it came alive again.
By the way i dont remember wher to set the warning time % of battery,i check in pref sys pwr energy on battery mode see nothing.
Thanks for help

This is the sign of a lithium battery almost on it's last legs, and it's not an unusual indicator. You can charge it up, and somewhere below 50%, it will just go to zero, shutting the computer down. It happens so quickly you don't get a warning. IF the battery stats are still good, you probably have a fair number of cycles on the battery.
Time for a new battery. Recommend either an OWC battery, which has gotten good reviews here, and can be seen at http://eshop.macsales.com/shop/powerbook/battery/g4-12inch-aluminum/ or an Apple battery, although the comments on the Apple web site are not very positive.

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PWG4 12 inches turn off without any warning still 47% bat

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