A Capacitor pack is a fancy name for a bank of capacitors. That is a series of capacitors that are electrically wired together to form what we would know as a pack. Each capacitor is wired in parallel to each other. The idea is to place the cap pack as close as possible to the ESC on the battery to ESC wires. The purpose is to smooth out any voltage dips that occur during operation.

Specifications: Cappack for Car ESCs (470u/35V*4PCS) to reduce ESC Temperature
Applications: TOROX 185