This is the Hobbywing 1/8th Standard Capacitor Module E.
This capacitor module (/cappack) is for “upgrading” your car ESC. With this cappack, the start-up acceleration of your vehicle will be greatly improved. Besides, the great ripple current endurance significantly reduces the generated interference due to the rapid ON/OFF of the ESC power tube
Specifications:
Standard 1/8th
XR8 Series
Ezrun Max Series
Quicrun 08BL150