I needed a new battery for my Lenovo ThinkPad T60p. So I went to bestbuy.com and used their battery finder. It found 2, but they were identical(price, picture, description, compatibility, etc...). So I ordered one. But when it arrived it wouldn't go on my laptop. It looked just like my old battery until I looked at the grooves on the edges where it slides into the laptop. There was the slightest difference there. Apparently I should have ordered the other one!