The "C" rating of the battery can have a big effect on performance. Think of the C rating as how fast you can pull those amps out of the battery before it starts heating up to dangerous levels that harm the battery and reduce it's performance.
I've never had a problem with 30C batteries working with just a single motor - but I have had problems with powering twin engine planes with 20C batteries, and with running quads on 30C batteries. In both cases the performance was sucky (technical term there - probably only 75% or so of the power I got from a higher C battery) and the batteries came down very hot. Those batteries ended up retired due to the cells not staying balanced anymore - middle cell just wouldn't take a charge right anymore.
There are some good threads and websites that walk through the math of how to calculate the potential draw of your motor / prop combo and based on the battery capacity tell you how many "C" it could draw at. Honestly though, I just buy 30C or higher batteries now, and never use the 30C ones on my twin engine planes.
Thank you for the great Explanation, now I get this.
To be honest, I am not an expert for electronics …
So I have another question:
I use the F-Pack Motor - EMax 2205 with 2300KV on a Floureon 3S 11.1V 35C 1500 mAh or the Floureon 2S 7.4V 35C 1500 mAh. I normaly use a Skywalker ESC with 40A instead of the 20A ESC's. (Just because I had it left). By now everything Looks fine and the System delivers plenty of power to my MM Sportster.
But I asked my self if this can be a problem for the motor or the the battery? because by now it is cold here, the summer is comming and I am afraid to overheat something or blow things up.
And does a bigger ESC means more power?