please help, HP Pavilion dm4 laptop problem?

hello, all. when i was playing games, my HP Pavilion dm4 laptop screen turned black. one of my friends told me that i should replace the battery. He said that he met the same problem with me. i would like to buy one from a online shop, because it is much cheaper. i have found two, but i do not know which shop is better. can you give some advice? thanks in advance.

[Only registered and activated users can see links. Click Here To Register...]

[Only registered and activated users can see links. Click Here To Register...]

The most important thing by batteries is the mAh. That should be so high as possible. If you are not afraid of buying in another country, there should be no problems.
But I think, you must pay in pounds or dollars, so that's the only problem I see.

I'm very sorry for my bad English, but I'm only a student from Austria.

Yours

Nibelung