The batteries that came with my light are ok but two are weaker than the others.
Here is a good easy to read article
I’m not one to get way nutty about batteries but some people here treat them as a hobby which is great when we can glean some good info that people like me, those who just want the dang thing to work, can use.
Here is a good easy to read article
Best 18650 Battery and Which to Avoid – Autowise
autowise.com