I’m sure I’m not the first to have this experience, but just a heads up for any builders out there; Zippy Flightmax batteries suck. I have wasted damn near $200 so far this summer buying replacement 8000mAh 3s LiPo batteries. It seems as soon as I get the next battery installed, a week later another battery has a dead cell.
If you are doing a budget build, you will not save money by purchasing Li-Po batteries. You will end up spending twice as much buying replacements for the crap quality batteries. Get yourself a quality Li-ion pack. I promise you it is worth it in time, money and headache. I have a spot welder now and I can build you a pack or one of many other people on the forum can as well.