The Nitecore MH10 v2 is a general-use flashlight powered by a 21700 Li-ion rechargeable battery, with onboard USB charging, and the ability to use a great many different sizes of Li-ion cells.

The Overready BOSS is the most expensive flashlight I've ever reviewed, and the best built. It's also one of the least efficient at higher outputs, and falls well short of its claimed performance. That's unfortunate, because its Lux-RC buck/boost driver is one of its major selling points over other high-priced lights which mostly use simpler electronics.

The Astrolux S43 is a 1x18350/1x18650 EDC flashlight with optional high CRI and USB charging. For those who wish the Emisar D4 had built-in charging, this may be the light for you.