Do ’oogle lithium-ion +safety +charging
Basics: never leave a charger unwatched; charge on a fireproof surface; if the cell vents gas do NOT inhale; understand the risks (significant) of unlikely failures.
You never really know what you’re getting with SK68 clones. I’ve never come across one with any kind of low voltage warning, let alone low voltage cutoff.
You can be sure what they claim for brightness is wrong, and odds are against actually getting a Cree emitter nowadays; you’re basically buying the shell and lens
Most of us take out the driver (15mm diameter) and LED (16mm star)anyhow and put in something better.
You can with a little patience and self control buy SK68 clones on eBay for $2 or less apiece, and cheaper by the dozen (literally).
Search auctions for, e.g., Cree zoom flashlight