Gazelle Batteries

[Gorlith]

Hi Guys,
Recently I got a Gazelle Value and love it.
Was wondering though, it comes with a 6 cell battery right?
How much more battery life could I expect if I got a 9 cell?
Is it worth the $130?

[thomasaaron]

I'm getting about an extra hour and a half from mine, but I have hdparm turned off (which is a power penalty).