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Give your battery a thorough checkup
Interesting comment, and it sure speaks better of my own iBook capacity ... it makes me wonder if the Knowledge Base article is wrong.
XBattery reports my capacity as 3.544 Ah and my voltage as 16.058v. Multiply the two together and I get 56.9096 watt-hours, which is actually a little above what the Apple Store describes as the capacity of the battery: "A 56-watt-hour rechargeable lithium ion battery that provides up to 6 hours of operation depending on battery saving features used and system configuration. This battery is compatible only with iBook 14.1" TFT displays." Here are the numbers I grabbed from the battery descriptions at the Apple store: iBook (12.1") - 42 watt-hours PowerBook (12.1" TFT) - 47 watt-hours Let's play this multiplication game with some of the numbers above from the original hint:
50.0022 watt-hours on a 12.1" iBook. (Possibly erroneous, considering a 12.1" iBook battery supposedly has a 42 watt-hour capacity.)
66.9634 watt-hours on a "newer machine" -- it's close to the stats of a 15.2" Powerbook.
48.7313 watt-hours on a TiBook; this could be a 12.1" TiBook.
19.8506 watt-hours on a 500 mHz iBook. Whether it's compared to the 42 watt-hour or 55 watt-hour figure, this is a depleted battery.
2.6797 watt-hours on a "very sick" battery. Yup, it's sick. :) Now, let's look at the ones in the comments: leffo: 52.3478 watt-hours on leffo's iBook. wilkens: 51.4476 watt-hours on wilkens' iBook. wOOge: 29.6692 watt-hours on wOOge's iBook. lockley: 17.6199 watt-hours on lockley's laptop. Enkerli: 35.316 watt-hours on Enerkli's iBook. tamenti: 23.3827 watt-hours on tamenti's iBook. Joegrind: 98.6348 watt-hours on JoeGrind's Powerbook. (Yeesh! That's off!) xchanyazy: 38.5453 watt-hours. mattmoss: 21.7055 watt-hours. dcheng: 45.7083 watt-hours.
Make sure you're looking at average voltage
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. |
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