Why does my Xiaomi notebook air 13 give me less and less working time?

The Xiaomi Mi Air 13 has a 5400mAh battery which provides 6 to 9 hours ideal standby time and 3 to 4 hours normal using time. However, the specific battery life depends on the actual using. If yours is draining faster than it says:

● You may have opened too many different apps and functions. To save power, close all unnecessary apps, processes, and functions.

● A higher screen brightness can also consume more power. Manually adjust the brightness to a moderate level to reduce power consumption.

● If these fixes do not resolve the problem, the battery may be defective. Please contact the aftersales service and return the laptop in for a factory repair.

Note: Do not suggest to play the notebook while charging, this could damage the battery and decrease battery life day by day.

The above suggestion sources from Internet.

The battery has strict compatibility issue, this battery should only work in Mi Notebook Air 13.3 2018, ans should only be replaced with part number R13B02W and R13B01W. When you decide your old battery is hopeless, you may get yourself a brand new battery here: https://www.storebattery.co.nz/xiaomi-notebook-air-13-7.66v-5230mah-laptop-battery-store-for-new-zealand-p-250303.html