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Make sure you're looking at average voltage
Authored by: magitekkn on Mar 14, '03 02:31:39AM

The important thing to remember while performing this math is that your voltage drops off almost linearly (it appeared to begin to drop more rapidly towards the end for me) therefore you should take the mean value of the voltage across the entire discharge cycle to get the proper value.

Looking back over my numbers, my high voltage at 100% charge is 16.7v, whereas my minimum was 13.9v. If my battery was able to hold 16.7v for the entire discharge cycle (I've never seen a battery capable of this personally) and held a 3.5Ah capacity, the power capacity would be 58.45Wh (note this is a 55Wh battery). However, if the battery held at 13.9 for the entire discharge cycle, there would only be 48Wh.

Now if we take the average of 13.9 and 16.7 we get 15.3v. 15.3v by 3.5Ah = 53.55, still close to Apple's rating for a new battery.



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