I received it today and it seems very good in terms of brightness. I connected it to a computer for charging via USB.
I hope it will last even though its use will be limited.
Today I left it on at the 1st level and for 5 hours it did not turn off or overheat. I did not expect that.
I charged it from a socket with a USB adapter.

For the little money it costs, it is quite good and of good quality if you want to spend double or triple you go for other qualities

Reliable and very powerful with a very good battery! It also has 2 additional functions that I discovered by pressing the intensity adjustment button and pressing twice quickly to activate the strobe mode

I have had this specific lens for 3 months, and I can say that it is the best purchase I have made for a small lens of 20 euros. I have it mounted on my bicycle with a handlebar base, making night feel like day. It has a sturdy construction, nice cool white light, good waterproofing and resistance to moisture. The included 18650 battery is very good, and the light spectrum can be adjusted according to the zoom I choose, ranging from a wide angle with a large radius that is convenient for cycling, to a small concentrated square light that comfortably illuminates up to 200 meters, which I have tested.