Electronic devices incorporating batteries can be capricious in extreme temperatures. This is therefore the case in winter, as soon as the extreme cold is felt.
Perhaps you have observed some unusual “behaviours” when using your iPhone, especially when charging. In winter, it is not uncommon for the iPhone to charge more slowly or even take much longer to turn on again once the battery is depleted. Maybe it doesn’t charge at all.
Do not panic, it does not come from the iPhone or the charger. This phenomenon is in fact quite normal when the temperatures are very low.
Batteries don’t like extreme temperatures
Apple is clear on this point and even mentions on its official website the temperatures to which its devices are resistant as well as the ranges recommended for optimal use.
This information is specified on the page Optimizing battery life and useful life. You can read in the part “Avoid extreme temperatures” that the brand’s electronic devices work “properly in a wide temperature range, with a comfort zone between 16 and 22°C considered ideal”.
However, there are small differences between the devices sold by the brand. Thus, this ideal zone is located between 0°C and 35°C for iPhone, iPad, iPod and Apple Watch. As for the more fragile MacBook, the range is between 10 and 35°C.
Storage temperatures are more extreme. All of the brand’s products can withstand temperatures included between -20 and 45°C. Apple recommends storing stored products for a long period of time with a half-charged battery.
Why such precautions? Because the lithium-ion batteries built into electronic devices are made up of living cells that die when exposed to extreme temperatures. That therefore valid for periods of heat wave, but also very cold. In both cases, the battery discharges faster and recharging must be better optimized.
But then why does an iPhone charge more slowly in winter? It’s a kind of security that doesn’t “rush” the battery cells. To avoid excessive temperature variations (and stressing the cells too much), charging is slowed down.
This applies to the iPhone but also to all other smartphones. Apple is just being more careful about charging. This is also why fast charging is not so much with iPhones.
What to do if your iPhone is cold?
If you find your iPhone after exposure to the cold, we advise you to wait a bit before plugging it in. You can choose to let him regain his strength at room temperature or slip it into your pocket.
For the most impatient, a reporter from Zdnet.com recommends using a plaid, an electric blanket and even a hot water bottle. If you must stay outside, leave the iPhone plugged into an external battery keeps the cells at the right temperature. And to slow down the unloading.
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Why does your iPhone charge slower in winter?
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