When I had to replace my computer's CMOS battery for the first time, I didn't even know what such a thing was. The battery had worked for years. Then I changed it, but the new battery didn't last very long. I figured it happens, it was a bad buy, so I just got another one. That one didn't last long either, however, and I had to replace it quite quickly. And just now I again get a CMOS checksum error. That's the third one then, in a row, that doesn't live very long. So I'm wondering: was I merely lucky with my first battery, and is the lifetime of a CMOS battery just not very long? Or have I been extremely unlucky in my purchases (all random brands, by the way)? Or is it possible that there is something wrong with my computer, that it is somehow destroying these batteries very quickly? I grabbed that last option out of thin air, I have no idea if something like that is possible, but I am just wondering.