I'm a little surprised we don't see small battery backup systems built into PCs or available as an add-on. One thing I really like about laptops is that they es

I'm a little surprised we don't see small battery backup systems built into PCs or available as an add-on. One thing I really like about laptops is that they essentially come with a built-in UPS, and I would love (some of) the desktops I work with to have that functionality built-in as well. Somebody please correct me if this thing exists and is available, I'd love to be wrong!