hi everyone,please could someone tell me the difference between blue and grey 18650s,and have you any preference with regards to trustfire or ultrafire and finnally which brand is the best,thanks for reading.
Both -fire brands are cheap products. If it's not a brick it works fine, vice versa. That's about it. If I had to choose 1 from two, I would go for trustfire. Not beacause i know trustfire is better than the other one, but becasue few trustfire grey protected batteries I got works fine w/o problem so far.
Grey or blue? I doubt if there's any noticable difference b/w them. It looks like its just different color.