Computer Battery?

I have a laptop that is about 2 years old.  The battery used to last for about an hour... now if the laptop is unplugged for more than 5 minutes it dies... even when fully charged.

I am sure the battery is starting to go... is it worth buying a new battery... what do they usually go for?

Check ebay, just stay away from the cheap chinese stuff.  Try to get the actual battery that came with it.

each laptop has a battery memory, i know it's weird...but usually i'll use it until it fully dies, then recharges it fully to maintain the memory.