SAMSUNG 25R 18650s are some of the best batteries on the market for either your mechanical or regulated mods. Rightfully so, they have thousands of positive reviews across all vape shops right now. These are currently preferred as VTC4s are getting more and more hard to find.
The great thing about these is that you get a 100A pulse that can last up to 60 seconds, even though the continuous discharge rate is 20A. This makes it one of the safest batteries available! You can see why people love them in their big mods exactly for this reason.
As always, please remember to be safe when using any type of high discharge batteries. Please charge them out of your mod (if it has a USB for charging) and make sure they are not fake!