What happened was is you went to high in mah. If you didnt solder it send it back for a 3600 or something. You get more runtime out of hgher cell counts but you have to get the appropriate KV motor for this. But 6s will still give you a tad more runtime than 4s packs with the same mah eve with the ame motor as long as you gear it properly. With the CC/2200 really with the fact that you can gear it to the moon on 4s without it getting too hot there really is no need for more than 5S usage. If you use the speed-gearing chart with 4s 5s and 6s and go a few teeth smaller each cell you go up you will see the top speed will stay the same. I hope that made sense and sorry if not.