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I only got the SP10B (I got both red & blue versions, but not the black) from Sofirn @ AliExpress.
So far, I notice for batteries, my flat-top PKCell 14500 didn’t work. But I think there was once where it did work. So my guess, is the flat-top usually does not “match” the “+” side head of the SP10B (the head does not use spring). Using a magnet spacer on the flat-top PKCell 14500, did make the flashlight work always though (so it appears to be an issue with certain [but not all] types of flat-top batteries).
Another thing I tested, I just purchased a protected 14500 (my first time to get hold of them), these protected 14500s are much longer than the regular 14500.
I tested the protected 14500 and it seems to be just a wee bit too long for the flashlight tail (it seems to screw in fully, but light does not turn on). As a random thought, since I also got the Sofirn SF14 (which worked fine with the protected 14500 I tested with). I screwed the Sofirn SF14 tailcap on the SP10B (it appeared to fit perfectly), then I pushed the SF14 tail button (so it’s ON), then used the side-switch. Now, the SP10B works with the longer protected 14500 battery.
(what that means is the SP10B tailcap is just a wee bit short so it doesn’t make proper contact when using longer protected 14500 batteries. But the SF14 tailcap is long enough to make contact with the SP10B body tube which made it work with the protected 14500.)
Just sharing my 2 cents worth of various random testing…