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Your 9 cell is probably knackered. I get about 7 hours out of mine and its two years old.

What OS/power-management are you running ?

FreeBSD 10 r10 stable with some ACPI frigs and dpms set up (I didn't write them down)

Windows 8.1 Pro with Lenovo power manager installed via windows update.

Dual boot.

New battery en route --- I'll be able to tell first-hand what the differences are in a week or so :)

Good for you :)

I would check the Lenovo recall page (google it) before paying for one. That's where I got my new one from - they replaced it free of charge ;-)