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A properly calibrated battery of PowerBook G4 should be sufficient for about 3 hours or so depending on system's configurations. (I have wireless, bluetooth, word, safari, iTune, MSN running).
The upcoming Mac OS X 10.4 Tiger will include a better "Battery Profiler" which allows user to configure the battery profile which I found out when test driving Tiger beta version. With proper configuration, you will find your PowerBook has longer battery life and display battery life more accurately.
Breber
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