Hi guys help out a brother here =) What are the difference between the battery specs. I know 18650 means 18mm diameter and 65mm length. My questions are more about protected vs. unprotected, When do I use a protected and when do I use an unprotected. If I'm using a mechanical mod shall I be using a protected? What about button vs. flat top? Besides the obvious length, do they make a diff performance wise?
