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How can the cold hurt your phone? Electronic devices always go silly when the temperature drops (your brain does, too, you know). You probably know the agony of trying to start your car on a cold winter morning, or standing helplessly by as your phone battery plummets, can make time seem awfully long.   How does this happen? The essence of battery charge and discharge is a chemical reaction. When charging, the positive electrode releases lithium ions and electrons; The lithium ions pass through the electrolyte and combine with high-potential electrons supplied by the power source in the cathode material to form stable compounds to store energy. During the discharge process, the anode material releases lithium ions and electrons. They travel back to the positive electrode through the electrolyte. The electrons will then return to the positive electrode to release energy. Of course, extreme temperatures have the worst impact on batteries, as in the apocalyptic scenes in movies, where nothing works properly. For typical phone designs, the best temperature for battery operation is between 0°C and 35°C. Excessively high temperatures (>35°C) can permanently damage battery capacity while using the phone in very cold conditions (below 0°C) can reduce battery life, which will eventually cause the phone to shut down. Under extreme temperatures( < -20°C or > 45°C); the battery will not only stop working but also shorten the usage. It results in permanent deterioration of its performance. In most batteries, as the discharge progresses, the voltage drops slowly at first. After a certain discharge level, the voltage drops suddenly. (Schematic diagram of the chemical battery discharge curve) Even under full power, the coldness will reduce the voltage output. Soon it will drop below the minimum voltage required by the phone, and you can witness the phone's automatic shutdown. At lower temperatures, crystallization might happen within the battery. The process is irreversible even it warms up. Under "more extreme" cases, crystallization will permanently deteriorate the battery. Your phone shuts off automatically? I can't imagine! How do we solve it? (Definitely not putting it back in your pocket to warm it up) Yes, to resolve your awkward situation (you don't want it to turn into a cold stone!). We tested it over and over again, just as you try to turn your phone on again and again on a cold day. (Glad we aren't ice sculptrue) -10°C -20°C -30°C -40°C It still works, and for 12 hours! Of course, thanks to our team of engineers, AGM battery freezing technology (name changed) allows the cell phone to operate at lower temperatures while the electrolyte in the battery is still functioning. You may not believe it (or try to sneak it into the fridge), but we do care. Our engineers have been focusing on rugged phones for years, our phones are not only smart but also stronger and more reliable under harsh conditions.