U.S. warfighters soon may power their battlefield electronics with a lightweight water-based fuel cell system. Consisting of thin metal alloy plates soaking in salt water, the technology allows soldiers to replace heavy disposable batteries with lightweight rechargeable ones. Because the devices have no moving parts and are made of readily available materials, they may provide troops with a simple and robust reserve or primary power supply. As individual soldiers are issued more sensor and communications systems, powering this equipment has become a challenge. The default energy source, batteries, presents many logistical difficulties. Disposable batteries are the most common power providers in use, but ground forces must deal with environmental and weight issues. Rechargeable batteries are beginning to enter service, but charging them in the field remains a challenge. Military services around the world are seeking technologies that will run soldiers' equipment without logistics complications.
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