The portable fuel cell systems JENNY 600S and 1200 weighing only 1.7 kg and 3.3 kg , are easily portable in a backpack. The two systems provide 600 Wh respectively 1200 Wh of electrical energy per day. Just a few fuel cartridges contain enough capacity for several days of operation. This means up to 80 percent of battery weight can be saved. Thus, soldiers can plan with a minimum set of batteries and carry additional food, water, and ammunition due to the weight and volume saved, allowing them to extend the duration of their mission.