Looking at that I might need another Rechargeable Battery - for my 13-inch MacBook aluminum mac book I have used 56 cycles since April 2009 and 97% health. I was trying to figure out why I don't have a six hour batt. times with the lowest setting and blue-tooth and airport turned off but now when I have all my settings turned down like birightness turns down to two so you can see the screen otherwise it is dark and my other settings are off why my batt. life is only two hours now??? I fully charge my computer up then only 2 hours??? if I set the setting to full with airport on and blue-tooth I get only 47 mins on a full charge... not sure why and my new laptop is doing this since it is only 2 months old.