Comment by myself248

I modded a laptop to charge over PoE in 2007. Before realizing that the places that had PoE, and the places I wanted to charge my laptop, had nearly zero overlap. It was virtually useless in practice, but I still love the idea.

I have not yet made a laptop to output PoE. Though it would be tremendously useful for provisioning IP cameras, there are dedicated thick-tablet-shaped devices for that, which do source PoE from their batteries.