Modern devices have sophisticated internal management systems that regulate how power is received and distributed. These systems ensure that the device charges at the safest and most efficient rate possible, preventing damage to the battery and other components. This means that even if you have a high-wattage charger and a high-quality cable, the device itself will control the charging speed to some extent.
Ways your device may regulate charging
- Charging Stages: Batteries charge in different stages, with the initial stage being the fastest. As the battery reaches higher levels of charge, the charging speed slows down to prevent overcharging and extend battery life. This is why you might notice your device charging rapidly at first and then slowing down as it approaches full charge.
- Optimized Battery Charging: Some devices have features like optimized battery charging, which slows down charging once the battery reaches a certain level to prolong battery lifespan. For instance, Apple devices with iOS 13 and later have an optimized battery charging feature that learns your daily charging routine and slows down charging to 80% until you need to use the device.