If your Xiaomi phone shuts down quickly, it may even become difficult to complete your daily tasks as you need to constantly use it plugged into the charger. Due to the large screen area and the energy it consumes, even the newest battery in today's phones can last about one and a half to two days. If you have tried all the suggestions for saving battery, but still the Xiaomi battery runs out immediately, it means it is time to replace the Xiaomi battery.