It depends on how you look at it. Other watch manufacturers do not allow you to replace seals / O-rings. If you damaged your watch you can send it back to
Suunto. First you will need to call 800 543 9124 and get a Ra #. Then send it in, they can fix your watch up. If not I wouldn’t even worry about the battery cover, just order a battery kit and replace it. If you can’t get it off, just call
Suunto they will be able to take care of you.