Thank you for your support of Xiaomi products. The POCO X6 Pro has undergone rigorous professional inspection before leaving the factory, so you can use them with confidence. When the phone is in a weak network condition, watching videos, and taking photos, the communication power consumption of the phone will increase, leading to a decrease in usage duration. This is a normal phenomenon. To prolong the battery life, you can enable the Battery saver function.
For your reference, here is the method to enable the Battery saver function:
Go to [Settings] >> [Battery] >> [Current mode] >> select [Battery saver] or [Ultra battery saver] as you need.