Differances in bk 12020 Warrior and 9920

[maxxdude1234]

Even a 100,000uF cap is very large. A 10,000F electrolytic cap is roughly the size of a D size cell.
Anyway even a 0.1F cap, with say 20volts (roughly 16cells) passing through it - it will only hold 2 coulombs of charge. If your motor is pulling 100A+ under hard acceleration, that 2C of charge will last you all of 0.02seconds. Even this would be an overestimate, you would probably get no more than 0.01secs of high current (100A+) from the cap. Its a nce idea but I don't think it would work practically.