I use the Olight Universal Charger for my 16340, 14500, and AA and AAA Eneloop batteries, it can also charge 18650.
Have had nothing but good results with it. I especially like that I can do both Eneloop and LiIon with it.
I still observe the rule to only charge while I am present, in case a battery starts to heat up. Have not had that happen.
here is an example of a kit that uses the Universal Charger, with a light that can use both AA and 16340. I like that the charger is USB powered, and very small.
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this charger does not have any selectable options, it is totally automatic.
I had one of those Olight chargers but it stopped working after a year or so. I only used it about 5 times so it’s not as if it was over-worked. I’d buy another one if I was sure it would be more reliable then the one I had