Yea I have heard the same thing but like you said close enough. The batteries that I will use both have the same number of recharge times and they are 3S 5000 so a series will give me a 6S 5000. And this will go on my new Carbon Core X4 650 quadcopter that's in the mail as we speak. I can't wait to start the build I think its gonna be fun I hope. The motors are 821 Watts 580Kv 3S - 6S 113 grams