Similarly: I'd love to have a little reading sconce on my wall next to my bed, but running a circuit through the existing walls without tearing them up is impossible. Why isn't there any attractive battery-powered home lighting? Sure, maybe overhead lights for lighting a room need more draw, but there's no reason to plug in a desk lamp, wall sconce, or coffee table light every day. Especially for renters who aren't about to hire an electrician—why no battery-powered lights designed for the home? Periodic recharging is annoying, but it's better than literally not being able to have a light where I want it.
There's a market here and it's not new technology. It's just repackaging existing technology with a splash of industrial design. Hell, the battery requirements for my drill are much greater than the battery requirements for my immersion blender. It shouldn't even be expensive!