Battery life for sony VGP-bps9 replacement battery

i ordered the battery from http://www.sony-laptop-batteries.co.uk/sony-vgp-bps9.ht..., now it works for 2 hours, but i am not sure if it is normal....

hey guys,,,
Sony VGP-BPS9 battery life (and its recharge times) will vary based on many factors including screen brightness,applications,features,power management and other customer preferenes. It's a good idea to set screen saver blank to 1 to 2 minutes of your notebook and turn down the LCD brightness of your portable computer.
This is what I found on this site: http://www.ubestbattery.com/sony-vgp-bps9.html
I hope it's helpful for you