The 2nd gen. of RovyVon's Hybrid flashlight (the 1st gen. is the H3 & H3 Pro) comes in the new year of 2022 - the Angel Eyes E3 series. It's powered by a built-in Lipo battery (charged via USB-C port), and a replaceable AAA battery. Opening (unlock) the light head to replace the AAA battery and lock it to use the external battery automatically.