The Bowens Small Travelpak Battery for the Gemini 200 and 400 monolights makes it possible (when connected to the required Control Panel) to power two 1500Ws lights to full power--a total of 3000Ws--miles from any electrical outlet. And you can keep shooting even when a battery starts to fade, with the hot-swap battery feature--you simply unclip the control panel from the depleted battery and clip it right on to a fresh battery, without waiting for a battery to charge. The Small Travelpak can provide power for up to 375 shots on a single charge and recycle in up to 2 seconds.