True but still, I have learned not to underestimate the stupid people when it comes to that, they could jury-rig the battery holder and wire up to cheap charger anyways thinking they would save a lot money.... But, I am glad that the OP asked instead, as asking the question would save you a lot of trouble.
When I have first learned about how to use Lithium-ion batteries, I have found that danger is not in the jury-rigging practice (after all, I do that too to check if the fresh battery's good to be welded into pack), but rather in the charger. Some cheap charger may actually have beefy transistors, other don't - the transistors are the most important part of the charger which control CV/CC charging mode while withstanding the current drawing.
EDIT: The charger 747 asked about would be able to charge 32600 battery - just be sure the battery holder can handle about 7 Amps max or more for safety. 1.5 to 2 Amps (divided by "mAh" / "Ah" to get 0.5 C rating).
I hear you, they are tiny, but that's what sinners new pen hosts take and I bought 5 of them , so I need to go 10440 shopping . I ordered 1 two cell version , and 4 one cell versions, so six cells in total. I was just wondering if anyone hear of those brands.
I do care about safety (call me paranoid), so I had to collect enough weblinks for candidate battery to buy then I can recommend some after identifying one of them to be actual IMR battery (both battery temperature readout and current holdoff).
I have indeed. Its run by RMM (BLF member) GREAT GUY with super fast shipping! He does it as a side gig to give flashlight guys over on BLF a better price (kinda like what I'm doing with the C6 heatsinks and custom anodizing). I just got 6x 16340s last week