Quark fried, blown capacitor...

[Serum]

You have any idea why capacitors are on controllers? not to protect the controller. They protect the batteries from the fast pulses the BL controller uses to spin the rotor.

Batteries will get a high internal resistance on pulse loads.. (on both discharge and charge) (throttle/brake) voltage will drop, batteries will get hot. They just can't deliver the juice on the high frequency the controller works on. Not talking about acceleration peaks but the switching frequency. Not to mention the pollution it will cause in the HF region..

Best way to protect the controller is to use trancil diodes on the motor side.

[zeropointbug]

Yes, they are to protect the controller, it would probably run cooler if you have more capacity, low-esr of course, slightly more power. Yes, they also protect the batts as well, they simply can't deliver the short pulses.