There are a lot of motion sensor area/closet lights that are lithium polymer powered with on-board USB charging. They tend to be flat, and the battery is NOT replaceable, or at least not easily, if you could find one.
I like the form factor but not the battery. One I have is probably down to 50% life after a year+ of use in a moderately high traffic area. That kind of makes them disposable.
Anyone know of this form that will take user replaceable 18650? Don’t mind if it’s a bit thicker to deal with the battery. Do not want AAA or AA type.