Battery calibration - actually worth it

Discussion in 'Mac Pro' started by Celeron, Mar 7, 2006.

  1. Celeron macrumors 6502a

    Mar 11, 2004
    There a comes a time with a laptop when it is necessary to buy a new battery. I've had my rev. B 12'' Powerbook for almost two years now and the battery is nearly shot. Only gives me one hour of light duty battery life. Videos or anything like that completely drain the battery in under a minute. In fact, if I let the laptop sleep long enough that battery goes completely dead and the clock would come back up as 1969.

    I entertained the idea of picking up a new, $129 battery, for a couple months now. Last night I finally went out and did it. When I put it in the first thing I checked the was the battery capacity. About This Mac --> More Info --> Power --> Full Charge Capacity.

    Now, only my old battery this number was low, under 2000. On the new one, out of the box it read 4400. I was happy. I wondered if I should even bother to calibrate it. I did. Now the full charge capacity reads 4547, it went up. Very nice.

    Always remember to calibrate your battery, at least once a month.
  2. calebjohnston macrumors 68000


    Jan 24, 2006
    I think your post got cut off, but yes. If you are thinking about trying a new battery, then try calibrating it first. Let it drain completely, and then charge it all the way up. see what happens.
  3. mad jew Moderator emeritus

    mad jew

    Apr 3, 2004
    Adelaide, Australia
    The purpose of calibrating the battery is to tell the computer just how much charge the cells can hold. Obviously in this case, your computer underestimated the charge of the battery which is understandable because it doesn't want to overcharge your battery.

    Continue to calibrate your battery each month. You won't get increases in potential charge anymore but it'll keep the computer's idea of charge and the battery's actual charge in sync. This is very important for battery longevity because overcharging a battery can be very damaging. :)

Share This Page