The Supercharger doubles the battery life and reduces the recycle time by more than 50 percent. It is powered by four AA-sized rechargeable batteries, making the complete set (strobe and add-on) running on eight batteries in total.
In addition, it acts as a helpful grip for strobe positioning underwater. With this add-on attached, the technical specifications of the Retra strobes include a recycle time at 40% power output of ~0.7s and the number of flashes at 50 percent power output of 700+. The combined (strobe and Supercharger) assembly weight is 1150g.