A must-have addition to the Graphite Main Chassis For Sakura D3 #SAK-D306/SG. It allows a sideways mounting of the battery close to the rear wheels. The Chassis has three different mounting positions to allow the user to best match their driving style. The kit utilises the elastic bands and plastic band holders from the original kit for a nice snug hold on the battery. At first, I couldn't work out how I was supposed to get the battery in, but the battery is installed by carefully bending one of the graphite arms on one side of the chassis down to slide the battery into place. It fits my lipo batteries perfectly, and looks great too!