For the most part, leaving your modern phone plugged into a charger overnight isn't going to be a problem. Inside is most likely a lithium-ion battery, which is partly responsible for how thin phones have become, as well as how they can last through a day with life to spare. They also don't come with some of the same problems as older nickel batteries used to have, like losing track of the maximum charge threshold.|
Lithium-ion phone batteries are not made to last forever. As soon as you deplete it and charge it — known as a cycle — you've begun a process that will eventually lead to your phone either needing a replacement battery or you in need of an entirely new phone. Battery University, in an article about how to prolong the life of lithium-based batteries, claims that on average you can get about 400 cycles out of a device.
Though it usually only takes a couple of hours to get a full charge, let's say your phone is plugged in for about seven or eight hours while you sleep. Once the battery hits 100 percent, it's going to stop charging thanks to software there to determine when it's had enough. Unless there's a breakdown in the process, you shouldn't expect to see a ballooned battery poking out of the back of your device.
Heat will harm your phone's battery
Your phone is smart enough to not take damage by overcharging, but there's still an issue. Charging a phone causes heat, which — along with cold — can damage a lithium battery. Prolonged periods of elevated heat will degrade a battery faster, as can be seen in this chart from Battery University.
egular charging shouldn't cause a phone to reach a harmful temperature, but if you like to keep your phone next to you in bed while it's plugged in, the blankets or pillows probably aren't doing it any favors. If possible, leave the charging phone next to the bed where it has room to breathe. A bulky case will also no doubt contribute to unwanted heat, so consider removing it as well.
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