[T500] Problem with SANYO 7800mAh battery

I've just bought new battery for my notebook.
On the battery's label I can find out that it's 7800mAh and voltage is 10.8V. It should be 9-cell.
http://i.imgur.com/td2a2aG.jpg
But the problem is that my notebook with this battery can work only for about 1h40m on maxium performance powerplan or just about 3h on maximum battery's life.
Attachment below shows Power Manager window. It says the battery is 71.28Wh ( 71.28Wh*1000/10.8V = 6600mAh!).
http://i.imgur.com/lN4ZwYq.png
Computer's configuration is:
C2D P8700 @ 2.53GHz
1x SSD + 1xHDD UltraBay
ATI M3650HD
6GB RAM
WSXGA+ 1680x1050
Windows 7 SP1 with no "powerhungry" CPU processes (idle CPU's overload on both cores about 0-2%).
My older battery which I used to use for 3 years with ~40Wh full charge capacity can power notebook exactly for the same time.
I tried to upgrade BIOS but it didn't gave me any solution. Resetting battery's gauge neither.
Does anyone know what is wrong with it? How long does your computer can work on the 6600mAh batteries?
Thanks for replies.
Solved!
Go to Solution.

After more than a year I'm back, finally I've found a solution!
Some history: I've bought new replacement battery, but problem was still on. I've upgraded my Windows 7 to Windows 8 and then to Windows 8.1 After some mouths I've replaced battery on guarantee, I thought it was the problem, but I was wrong. Yesterday I decided to do something with strange noise coming from inside of my computer (pitchy noise, something like electronic circuit, I heard that since I bought my computer- 5 years). I changed in BIOS almost all Power settings to "Disabled":
Intel(R) SpeedStep Technologyisabled
Adaptive Thermal Management:
Scheme for AC: Balanced
Scheme for Battery: Balanced
CPU Power Management: Disable
PCI Bus Power Management: Disable
PCI Express Power Managment: Disable
(screenshot below)
Also I've changed "minimal CPU load on battery" in system's power settings from (5% to 100%).
Woah, everything works awesome now! And no strange, loud noise from my computer anymore!
On 7800mAh battery I get around 220 minutes on battery with brightness set to 100%.

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[T500] Problem with SANYO 7800mAh battery

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