Huh! I used Google to find the battery install page (which was pretty limited, not even revealing the battery type!). If Garmin is hoping that V3 owners will place a drop of oil on the batteries during the change, maybe they should make that information more evident. (thanks for the link!) Even a link to the support page from the battery install page would be helpful. But, really, shouldn't much/all of the 'support' page linked above be in the 'battery replacement' page in the online owners manual? Duh.

EDIT: typo fixed and page referenced clarified