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We have previously been told not to leave our phones charging overnight because it ruins the battery life. Is this still the case?
It's bedtime. You set your alarm, notice your phone is down to 23 per cent battery, plug it in beside the bed and go to sleep.
By the morning, it's been connected to the charger for some seven to eight hours — much longer than it needed to reach 100 per cent, especially if it's on a fast charger. : don't leave your phone charging overnight and avoid bringing the battery up to 100 per cent to preserve its life span, ideally keeping it between 20 and 80 per cent.
In principle, that advice is still sound because the fundamental chemistry of the battery inside your phone hasn't changed. Regularly draining it to 0 per cent and then filling it up to 100 per cent will shorten its life span.
However, modern phones have improved battery health management and charging controls. As a result, the answer to whether it's okay to leave your phone plugged in overnight has become more nuanced in recent years. Rather than simply telling people not to charge overnight, modern phones can increasingly manage what happens to the battery during those night-time hours. Samsung and Google Pixel phones both offer a similar feature.
Pixel phones have "adaptive charging" which also learns charging habits and" which stops charging at about 80 per cent while you sleep and adjusts charging to reach 100 per cent just before you wake. With the new iPhone 17, Apple has also introduced adaptive power mode, which learns typical battery consumption and anticipates when the user might run low, then adjusts power use to help theSo what about charging only to 80 per cent?
Reducing time spent at a high state of charge can help manage battery wear. But manufacturers themselves no longer treat 80 per cent as the only choice. Apple's iPhone 15 and later have a similar feature, allowing users to choose between 80 and 100 per cent in 5 per cent increments.
The phone can even recommend a particular limit Instead of using adaptive charging, Google Pixel 6a and later devices can simply be set to a limit of 80 per cent, an option that's ideal for people who usually finish their day Ultimately, not charging your phone fully is a trade-off between reducing battery wear over the longer term and having more charge available day-to-day. If 80 per cent comfortably gets you through the day, a lower limit will make sense.
If you're travelling or facing a long day away from a charger, you may want to use more of the battery's capacity. Even if you do choose a lower charging limit, your phone may occasionally charge itself to 100 per cent so the device'sWhile all these new charging features can prolong the life of the battery, they don't really address another important factor: heat.and will degrade over time if stored in hot conditions, especially if they're also being charged at the same time.
The general advice here hasn't changed. Always keep your phone away from excessive heat, including leaving it in a hot car or in direct sunlight. If charging at bedtime, make sure you're not tucking your phone under a pillow or other bedding which could trap heat and risk overheating the device. For most people using a modern smartphone, the answer is yes.
The phone manages charging automatically, and you don't need to wake in the middle of the night to unplug your phone at exactly 80 per cent. Instead, check what your phone offers and use optimised, adaptive or sleep-aware charging if it suits your routine. Consider a lower charge limit if you don't need 100 per cent every day. Above all, avoid excessive heat.
Even though phone batteries still aren't immune to aging, we now have more options to try and prolong their life with smart charging features — so it's a good idea to check your settings and let the technology do some of the work.
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