Ive used all brands from Hobbypartz(Blue Lipo, Gens Ace, Sky Lipo) and all from Hobbyking(Zippy Flightmax, Turnigy, Rhino) and all have been good. Not much difference between like packs from brand to brand. I used to buy Gens Ace alot and Ive been buying Sky Lipo now. There a little cheaper and I cant tell between my Gens Ace 4000mAh, 30c, 2s and my Sky Lipo 4000,30,2 other than price