Like others have said, stick with the quality brand names, LG, Sony, Samsung, AW, Sanyo, Etc.
I still have LG HE4’s (2500mAh 20A) made in 2014 that are just starting to show wear. All about keeping info on them as to what to use them for, how much you let them drain, How they are Charged and Stored/Rotated, etc.
I have some recently bought LG HE4’s that were still made in 2014 that run as good as when they were made! It’s all about Great Chemistry, Storage Conditions and Storage Charge, Especially when bought from a reputable dealer.
I saw someone mentioned something about a vendor showing alot of their batteries Unprotected & Protected. I believe Liion Wholesale offers certain LG and Samsung batteries Protected such as the LG MJ1 & F1L. More for Flashlight usage.
Please correct me if something is wrong, I fell off Vaping for a while but slowly working on switching back. I always try to keep up with Mooch’s tests though, he has proven himself over a Billion Times!
Also I have been using a good bit of 18650 Flashlight’s lately and have been using my cells that were originally for my Vape Mods. Lol