It’s bedtime. You set your alarm, notice your phone is down to 23% 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%, especially if it’s on a fast charger.
You may have a vague recollection that this could be bad for your phone’s battery. The chemistry that makes lithium-ion batteries rechargeable has a limited shelf life, and it’s shortened by repeated charge-discharge cycles.
In the past, the advice has been simple: don’t leave your phone charging overnight and avoid bringing the battery up to 100% to preserve its lifespan, ideally keeping it between 20% and 80%.
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% and then filling it up to 100% will shorten its lifespan.
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.
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