One of the best and most reliable ESCs money can buy for an electric skateboard, the Enertion FOCBOX has it all. And at a decent price, it really provides the bang for the buck. This is the controller I use in all my ridiculous 12S boards, so you know it handles 12S just dandy and that this isn't just some marketing bullet point.
Don't forget to download the software! FOCBOX is based on VESC 4.12 hardware.
3 month replacement warranty for defective units installed by the customer, 1 year for units installed by us. Damage incurred during installation or improper installation will void the warranty. Basically, if you put it in wrong and fry it, i'm not replacing it for free. If you put it in and it works correctly for a while, then it fries on its own out of nowhere, I'll replace it for free within the first three months.
Features and Specifications as stated by the manufacturer
Built into protective hard case
Aluminum heatsink included
5V 1A Output for external devices
Regenerative braking charges battery
Sensored, Sensorless, and Hybrid Motor Control
Powerful and adjustable start up torque on sensorless motors
Micro USB interface
Voltage rating of components 8V-50V
Compatible battery 3S to 12S
Actual, dependable operation at 12S. Not just a bullet point.