They make USB rechargeable lithium ion batteries in every common form factor. I use lithium rechargeable AAA batteries in my mouse and they work great. You don't even need a charger, they are USB-C. Highly recommend.
I use my front facing camera to see under things all the time. It's very useful, even though I don't take selfies. I'm an engineer though so I probably spend more time looking under things than most.
Any owls around? Some make seriously weird screeches.
Just finished building this beast. It's a ratrig Vcore 3.1 with a 500x500x500mm build volume and blazing speed.
I mean I can't really blame them for being smaller, the USB port is a lot of value added but is also pretty huge.