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That's just a basic rough estimate formula.
The higher the C rating, the lower the internal resistance of the battery.
So where your motor draws 30A, so it stands to reason a 20C 2000mah and 100C 2000mah will both provide enough amperage to run it, so they should have the same performance since the motor won't ever draw more than 30A.
Well in practice that is not true.
A higher C rating will have SLIGHT performance advantages over a lower C rating since there is less internal resistance.
Between a 25C and 40C there is an audible difference in ROF on my guns. Not huge, wouldn't prevent me from running 25C batteries, but it does make some difference.
Also, throw that battery out. Once a lipo gets hot, it's suffered internal damage. Once it's suffered internal damage you now run the risk of it venting during the charging process.
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