Soonfire FD39 USB Rechargeable Bright Bike Light
[FD39]

I'm giving this flashlight 5 stars, even though it comes with a relatively lackluster 18650 battery. However, that's fine, and you can get another battery if you want. The thing I like about it the most compared to most other "tactical flashlights" I've tried is the side button. You use that button to set the brightness, and the rear button to turn it on or off, which keeps your brightness setting. This solves the issue of having to cycle through all the brightness settings and flashing since most lights have a single button. It's a nice high-quality metal button, and I'm very impressed with the overall build quality of this light. The battery can be charged by removing it and putting it in a standard charger, or you can plug in a USB cable.