Should You Leave Your Phone Charging Overnight?

Dario d’Elia Gear Mar 17, 2026 5:30 AM Should You Leave Your Phone Charging Overnight? It used to be common wisdom that leaving your phone charging overnight degrades the battery. But handset design has evolved to mitigate the harm caused by constant charging. NurPhoto/Getty Images Save this story Save this story You may have heard that leaving your smartphone charging overnight—either plugged in or atop a wireless charger —can damage your battery. But is it actually harmful or dangerous to do that? Or is this one of those persistent phone battery myths that refuses to go away? The simplest and most straightforward answer, according to most experts, is that you can leave your smartphone charging all night as long as you are aware of some limitations and details. The practice of leaving your phone to juice up through the night is not as problematic as it used to be. Starting in 2010, manufacturers have made it customary to integrate power management chips into their designs that choke the power coming in when the battery reaches 100 percent. The first such chips—called power management integrated circuits, or PMICs—began to peep out from the mid-2000s but became standard in phones somewhat later. When integrated into a motherboard, the PMIC manages things like battery charging, the system's sleep, wake, and power cycle events, and the voltage and current used by the display, processor, memory, and other components. It optimizes all of these things to reduce the overall power consumption and extend the device's battery life. These chips also prevent phones from overheating too much, and they consequently reduce the fire risk to near zero. It can't do all of that by itself, though. You still need to take care of your battery . The best way to keep batteries from incurring too much wear is to keep the cell charged between about 30 percent and 80 percent. Doing this reduces the thermal and chemical stress on the lithium-ion cells. Apply common sense to this advice; don't...