Putting a UPS in a rack is a prosumer/corporate IT thing, it’s not done in real datacenters.

They typically have their own UPS in another room and multiple power lanes. And it’s going to be much more reliable than a laptop battery.

I didn't really think that any of what I wrote would be taken seriously to the point of needing a retort. I mentioned blade servers and knew rack unit measurements which as context clues would have suggested I was familiar with actual data center equipment.