Battery 4000mAh of Tradebit for replacing the factory one Xiaomi Mi 9T ProXiaomi Mi 9T Pro, Redmi K20 Pro. If your mobile phone battery lasts very little, drains suddenly after a call, is swollen, or no longer charges, it is time to replace it. Modern smartphones do not make this process easy, as they can only be opened with special tools, and it is recommended to consult a specialized technician as any mistakes may result in the malfunction of your device. See full description