Extensively tested and demonstrated by team ROTORWORKZ USA, these OUTRAGE XP packs are proven to be extremely powerful and are very cool after flights. These batteries are surprisingly very well balanced right from the factory and are very compact resulting to one of the lightest batteries on the market. With low price, low weight, high performance and 50% crash replacement within 6 months of purchase, these batteries are most highly recommended by top pilots. Videos of 6s1P pack on OUTRAGE G5 helicopters on YOUTUBE. Videos of 4s 3700mAH on HDX500SA on YOUTUBE. Check out Trextuning.com Review and HeliFreak.com review.