1 and HarmonyOS system 3 have outdated CPU versions and outdated power management systems. HarmonyOS System 4 adopts more advanced technology, more efficient CPU and more optimized power management system, which can better control power consumption.

2. During the software shutdown process, HarmonyOS system 3 still consumes a lot of power in the background. HarmonyOS System 4 optimizes the software and adopts more intelligent algorithms to reduce power consumption.