Somehow I've been super lucky. I've got a Pi B+ that has been running nonstop in my garage for years as a security camera. It doesn't have any kind of battery

Somehow I've been super lucky. I've got a Pi B+ that has been running nonstop in my garage for years as a security camera. It doesn't have any kind of battery backup, though power outages here are pretty rare. I've also got a rev 1 model B set up with an RTLSDR dongle to log readings from my gas meter. Same situation.