Ok so iwas wondering how long my psp battery will last me while running a UMD and if any1 knows any good websites(UK) where i can buy a cheap extra battery

I would say ebay for a spare battery but a lot of the listings are based in hong kong they are cheap £5.00 to £10.00.
Play.com battery's are between £14.99 and £17.99 and they are not sony products so its worth buying from ebay and waiting a little longer for delivery.
As for battery life its about 4 to 6 hours but i play my psp a lot at home so its plugged into the mains or my pc most of the time so it never runs out on me.

If you put the UMD into the PSP and go to settings and battery information that is the amount of battery that you have left should you continue to use the medium that is currently in the drive, works the same for a game if you want to check out that time too.

OK TAHNKS I JUST GOT MYSELF AN X2 BATTERY FROM PLAY.COM

OK TAHNKS I JUST GOT MYSELF AN X2 BATTERY FROM PLAY.COM

no probs I'm glad the info was a help.