Make sure you get the correct length (mm).
This is a good source. Before I ever got into night calling I was a big flashlight enthusiast. I run a flashlight with a 18650 and these work great. The 18 stand for 18mm diameter and the 65 is 65mm length. All batteries are know by their numbers commercially. It's just that we named them differently in the consumers sector, AA, AAA, etc.Lots of choices here.
18650 Batteries
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This is not entirely correct. You can definitely purchase unprotected button top 18650 batteries. I’m unaware of protected flat top 18650 batteries, but they may exist as well. Just be sure to read the specs on the batteries when you purchase them.@Spurchaser the protected ones have a button on one of the ends. The unprotected ones are completely flat.
I'm all kind if wrong today...lol. I went ahead and changed it.