That is best, generally half max will give you good battery life and lots of room for aged batteries to still be safe. At that level you'll probably replace them due to dropped mAh, before they even get warm let alone hot.Thanks everyone. I don't anticipate ever needing to go over 50-60 with prebuilt coils and 60-70W with my own builds so I think I am in a fairly safe window. I appreciate all your input. Have a great week!