OMG, how many people have this misconception
I know this is not important for your project but still just to clear the basics...
When you connect 2 LiPos having same Voltage, Capacity (mAh) and C Ratings together in parallel then the C rating doesn't get added.
3S 5000mAh 20C + 3S 5000mAh 20C = 3S 10000mAh 20C and NOT 40C
Theorotically,
20C in 5000mAh 20C means 5000mAh X 20 = 1,00,000 mAh = 100 Amps constant discharge at 11.1 volts
20C in 10000mAh 20C means 10000mAh X 20 = 2,00,000 mAh = 200 Amps constant discharge at 11.1 volts
C ratings does not get added because it is based on the storage capacity of the LiPo. Increase in Storage capacity automatically increases the Discharge Rate but the C rating still remains the same.