Great light, great headband.
I don't think the documentation mentioned charging. The meanings of which symbols are lit up and the color of the symbols weren't obvious to me, and I didn't know you had to do a partial turn of the cap to start charging. Looking at pictures online, it seems like previous version(s) had a little graphic on the tail to let you know.
Also, the tail magnet is strong enough that it can catch on things. Great for holding itself up, not so convenient for working in confined, metallic spaces.