Whenever I get a no name cell, I usually test its capacity (out of pure curiosity), and then discharge it and toss it. I have plenty of brand name cells, so I don’t feel the need to keep the unknown ones in circulation.
This looks like a Sony VTC5… A very decent high drain cell if genuine. If they are not damaged, it could be worth putting them to test in a charger - in a safe way as mentioned above, just in case.
And weight them to check with other cells weight. Low quality cells are usually noticeably lighter.
It also makes sense to stick a label on a VTC because there’s nothing written on them - or so barely readable. This most certainly comes from a vape shop. How they ended up on the street can only be guessed. Some mod user just lost the spares he was carrying? He/she’s probably missing them.
peel the sticker and look for printing.
the sticker is for shipping regulations.
i also suspect sony vtc5.
nice for a high drain light like a well driven triple.
as for safety i would have no problem using those.
I often find meth heads dumpster diving behind a store that sells batteries and bulbs, it is amazing what they find. One guy pulled out an entire display of 12 brand new aluminum bodied flashlights. Just little multi LED triple AAA jobs. maybe 20 lumens, but the sheer number of 18650 cells they get out of the dumpster, tells me they do not recycle them at all.