New 17' battery capacity 3000mAh less than my old 17

After chewing through the battery far too quickly on a new 17' 2.3 I checked in system profiler/power at battery capacities of the new and old 17 (2.8 core 2 duo from 2009). The new 17 says 8729 mAh and the old one says 11879. That would explain the reason the new machine runs out of juice, but I dont understand the drop in capacity as Apple advertisers it has the same size battery as the older 17's.
Does this 17 have a problem or have I missed something. Ideas please.
Could others with a new or older 17 (unibody) please post your battery capacities to see if I am alone or whether others see the same thing. Thanks.
I love the speed of this machine though. Far far faster.

The current 17" MBP lists a 95 watt-hour battery.
Assuming the nominal voltage is 10.8 volts like the removable batteries.
95 watt-hours divided by 10.8 volts = 8.796 ampere-hours
8.796 ampere-hours times 1000 = 8796 milliampere-hours
8729 / 8796 * 100 = 99.2% of full charge capacity.
Your battery is fine.
Look up the specs for your old machine and perform the same calculations.

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If you have a MacBook with the removable battery you can get a new third party battery fairly cheap on eBay.
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White Batteries http://shop.ebay.com/i.html?_nkw=macbook+white+battery&_sacat=0&LH_BIN=1&_sop=12 &_dmpt=Laptop_Batteries&_odkw=macbook+black+battery&_osacat=0&_trksid=p3286.c0. m 270.l1313
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