I have a Light & Motion Urban 800 and recommend it highly. It replaced a L&M Urban 500 that I used for several years. The 500 needed a new battery, but L&M sold me an Urban 800 at a discount rather than replacing the battery.

The Urban 800 checks all of your boxes. Light output 800 lumens on high (and L&M does not inflate their ratings), good battery run times, easy to mount and remove, very light weight, USB charging. If you shop around on the internet, you should be able to buy one for much less than retail price. I did not buy the fast charge model because I don't need it.