This Is What's Happening To Your Battery If You Charge Your Phone To 100% Every Night

"“a battery will degrade faster if you charge it to 100% versus a little bit lower state of charge,” Wang said. Keeping your phone plugged in once it hits a full charge and consistently charging it to 100% keeps the battery at a high voltage, which causes chemical aging in the product, said Dibakar Datta, an associate professor of mechanical and industrial engineering at New Jersey Institute of Technology."

"Wang noted that if you frequently charge your phone to 100%, your battery will deteriorate roughly 10% to 15% faster over your phone's lifetime than if you charged it to consistently to a lower percentage like 90%. “So it's not a whole lot, but it's noticeable,” he added."

"Overall, this deterioration is slow, and phone batteries now are pretty durable, so you don't need to be too worried. “[Batteries] last, probably, longer than the other features of the phone,” Wang said. You likely will need a new phone for other reasons, such as camera quality or a broken screen, before you need one for battery issues."

"This doesn't mean you should never charge your phone to 100%, though. For better phone battery health, you should also keep it from getting too hot or too cold. And be wary of “fast” chargers. It's natural to be tempted by fast chargers. Who doesn't want access to their phone more quickly? But experts say they shouldn't be used too often. “Slow charging is more preferable,” Datta explained."

Charging a phone battery to full and leaving it plugged in keeps the battery at high voltage, which accelerates chemical aging. Frequent 100% charging can cause roughly 10% to 15% faster deterioration over the phone’s lifetime compared with consistently charging to around 90%. The overall degradation is slow, and modern phone batteries are durable, so battery failure is unlikely to be the main reason for replacing a phone. Charging to 100% occasionally is acceptable. Better battery health comes from avoiding extreme temperatures and limiting the use of fast chargers, since slower charging is generally preferable.

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