New from Factory RC for the Yokomo B-MAX III Factory Edition is their latest ‘Polarity™’ strap. Designed for the “Lightweight” or “Shorty” battery configuration, which has become the standard, Factory RC’s latest offering has machined polarity indicator markings in the strap to help prevent hooking up your ESC incorrectly. Simply flip the strap into the proper position to match your batteries polarity. Strap is milled for weight and stiffness and direct “factory” fit to the existing hardware.
Source: Factory RC