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On my PowerBook 3400c, I normall just spin the harddrive down and type my notes in BBEdit... I'll spin it up every 15 minutes or so to save the file, and then spin the power back down. Doing this, I routinely get 3-4 hours out of my battery.

Weirdly though, the other day in class I turned the bringhtness down on my monitor (I normally have it set to full) and I actually found it worsened the battery life, cutting it in half... Does anyone know why this would be?
 
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