Leaving your phone plugged in all day does not cause immediate damage, however, it can have some long-term effects on the battery and device.
For your reference, here are the reasons as follows:
1. Battery degradation: Modern smartphones use lithium-ion batteries, which are designed to stop charging once they reach 100%. However, keeping the phone plugged in for extended periods can keep the battery in a high-stress state, which can accelerate degradation over time. You can enable Optimized charging to slow down the charging process, ensuring the battery reaches 100% just before you need the phone;
2. Overheating: Charging generates heat, and leaving the phone plugged in can cause it to remain slightly warm, especially if it’s in a case or if you’re using it while charging. Continuous exposure to heat can degrade the battery faster. So keep your phone in a cool environment while charging to prevent overheating;
3. Battery lifespan: Lithium-ion batteries have a limited number of charge cycles. Keeping the phone plugged in continuously can lead to more frequent small charge cycles, which can reduce the overall lifespan of the battery. Disconnect your phone once it’s fully charged to reduce the time it spends at 100%.