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The portable fuel cell system SFC JENNY 600S only weighs about 1.7 kg and is therefore easy to carry in a backpack. The system provides 600 Wh of electrical energy per day. Three to four 350 ml fuel cartridges contain enough capacity for 72 hours of deployment. This means up to 80 per cent of battery weight can be saved. Therefore, soldiers can equip themselves with the minimum of batteries and instead carry additional food, water and ammunition, having saved the weight or alternatively extend the duration of the mission.