Marushall: As I told you, it is not an American Standard Oring size. It´s metric (incidentally, is the same Oring used by other computers, such as the TUSA IQ900 Zen, Aeris Manta and Aeris F10). I´ve replaced the battery in quite a few TUSA Zen, Manta´s and, of course, Atom´s, always used the...