||The 255mah HIGH VOLTAGE pack is for those that want to sacrifice a little bit of weight for a considerably longer flight time and more PUNCH! I flew these packs as hard as I could with Special Sauce motors and got 3:40 of flight, though when I'm not flying super hard i get near 5 minutes. This makes new flights paths a possibility for the first time. I couldn't be more happy to have these things in my arsenal. I can sometimes feel the weight- but the extra power and flight time makes up for it.