A low–temperature emergency power source designed from warm pastes based on hydrogel

Outdoor activities like mountain marathons and field expeditions often occur in harsh environments where maintaining power and body temperature are crucial for survival. Warm pastes are commonly used to provide warmth in cold conditions, but their potential as a portable power source has not been fully explored. This research develops an innovative approach to convert warm-paste chemical energy into electrical power for emergencies. By designing a hydrogel-based iron–air battery with a low-temperature-resistant electrolyte, researchers created a battery capable of operating in low temperatures. Experimental results showed the battery generating 0.98 V of voltage and 2.68 Ah of capacity. The battery can be manually assembled using original warm paste materials and connected in series to power electronic devices like mobile phones, providing a vital communication tool in emergencies. This breakthrough offers a promising solution for enhancing safety and survival during outdoor activities.