This battery is a beast in every sense. It's big, heavy and powerful. A bigger capacity combined with the highest C rating makes a noticeable impact on flight times and the ability to sustain high throttle throughout the flight. These come to us as 75C packs but we're a bit more conservative on the ratings. If your 1300s are screaming for mercy at the end of every run, this may be a more appropriate choice. The extra weight feels well balanced against the extra power available. A couple of the guys thought we were running 5S because of the speed!