Why does the Xiaomi 15 charge slower than the Xiaomi 14?

To enhance the experience in terms of battery endurance, the Xiaomi 15 has a significantly larger battery capacity. However, since the charging power remains unchanged, a larger battery naturally requires a longer time to fully charge. This is a normal phenomenon. Before leaving the factory, the device undergoes rigorous professional inspection to ensure the charging power meets the required standards, so you can use it with confidence.
To optimize charging efficiency, please refer to the following steps:
1. Open the [Settings] APP on the phone;
2. Scroll down and tap [Battery];
3. Select [Charging options];
4. Tap [Wired charging mode], and select [Top speed].
Note:
Avoid high temperatures while charging to maintain efficiency.