Blue leds tell me the user spent $15 more for the color of a 2 digit display. I have both, red mini is my favorite because it's brighter (easier to read when traveling outdoors) and I like to see my finger or thumb turn red when Im vaping, dunno if that works for darker skinned people.
I buy my batteries from provape, my last battery purchase was 85 cents because I used my reward points from provape