well you need the security bit to open it, a tabbed battery to replace it. soldering stuff (iron,etc) (some soldering skill doesn't hurt) you should clean the contacts while your in there, which takes more than just alcohol ---OR--- there is some jackassery where you hold the battery in with tape. really? tape? I bet there are Ebay sellers using this method which is why I like to show the game opened after I replace one.