8K lumens, pretty hilarious.

Yeah, I bought a half dozen of the various magic shine knockoffs about a year and a half ago, most all of them with a battery pack. I've had one battery set "fail," meaning it works intermittently, if at all. The other 3 or 4 sets are working just fine, for now anyway.

The problem with the battery packs are that the connecting wires are super thin and fragile, and the soldering is very minimal, just a tiny touch of solder. You have to be a bit careful handling the battery packs.

The lights themselves work well. I get over 2.5 hours running at full blast, which is pretty good as far as I'm concerned.