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Why iPhone and iPad are turned off in sub-zero temperatures

Winter came, and with it — hard frosts and technical support and forums are traditionally showered with complaints from users of quick discharge of battery and disabling the iPhone and iPad in sub-zero temperatures. The reviewers I figured out what was happening with the charge gadgets, how to do this.

Indeed, in the frost on the phone long talk: the machine starts acting weird, and then shows low battery indicator on and off. Very often this is a problem for users that have chosen Apple products. American manufacturer on its website clearly States that does not guarantee stable operation of their smartphones and tablets at a temperature below zero Celsius.

Sufficiently prolonged stay outdoors at a temperature of about -5°C on the iPhone and iPad may appear to malfunction at -10°C Apple devices indicator shows full battery and shuts down.

However, actually the battery in the cold battery does not lose — he kept at the same level as before. However, prolonged exposure to subzero temperatures on the battery gel which plays the role of electrolyte in modern lithium-ion or lithium-polymer batteries, changes its density, becoming more viscous, the speed of movement of lithium ions is slowed down, which leads to capacity loss and other factors battery.

The smartphone may not be enough power to properly run applications and tasks, and the battery controller senses the drop in its characteristics as a low battery warning.

Low temperature also affects the screen and the sensor. The response speed of liquid crystal cells slows down, and you can see the loop when animating interface elements. Less affected by low temperatures only AMOLED displays.

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Different manufacturers have different attitudes towards exploitation of its products in sub-zero temperatures. If Apple rigidly sets the range of its smartphones and tablets from 0°C to +35°C and voids the warranty if the device is operated outside this range, other makers do not establish such restrictions, and their smartphones can be operated in temperatures below -10°C. However, together with the race for the thickness, weight, and power smartphone case devices are becoming thinner, the filling is more complex, and the impact of frost on their work more visible.

However, with proper use of the iPhone even in freezing weather with nothing will happen. We must remember that it will turn off only after prolonged exposure to freezing temperatures, so you can quickly see the message or check card, but if you still need to talk some time, it is best to come into the room or use a headset, putting your smartphone in the internal pocket of warm clothes.

In order to preserve precious heat device you can resort to a rather simple method, “wrapped” it in the case, which will not only protect from drops, but also help to extend the time in the cold. Even a simple silicone case slightly, but reduces thermal conductivity, so the device is cooled more slowly. Greater effect can be achieved if you carry the smartphone in a thick felt cover.

Also to hold out a little longer the phone will help running in the background memory-intensive app, such as demanding 3D game. This will increase the CPU temperature and, as consequence, the temperature in the housing.

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If the phone is still frozen, and we should not rush to conduct active operations on the intensive care unit (charge, dry, put on the battery, etc.). The best solution is to let it lie an hour or two at room temperature. Then the battery will return to its regular characteristics, and condensation that forms from temperature changes and to close the contacts, dry.

Especially it is not recommended to charge a frozen battery and warming it. The fact that the temperature difference of the battery case may deform and vent, and an active element such as Li, having entered reaction with oxygen can cause fire or even explosion of the battery.

The most known was the case in 2011, when a resident of Norway decided to connect your iPhone in cold car for car charger, with 12-degree frost. The casing is deformed, the screen is busted, and, upon application of the owner, her eyes from splinters saved only by the fact that she wore glasses. Apple has refused to pay damages because the iPhone is operated in sub-zero temperatures.

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