Heading to the last part of this Xiaomi Mi Band 4 review comes the battery life. The Mi Band series is known for its long-lasting battery, running up to 10 to 30 days. However, with the increase in screen size as well as the introduction of an AMOLED colored display, the Mi Band 4/Band 4 NFC is much power-hungry than the previous generations. Thankfully, Xiaomi also decides to increase the battery life of the fourth-gen from 110mAh to 135mAh (25mAh increase).
Due to limited time, I can’t show you the battery timing from a 100% charged Mi Band 4 to 0%. So, when I just opened the Mi Band 4 (NFC version) it was charged 58%. After the use of 20 hours, with continuous heart rate monitoring and lift-up screen option turned on, band always connected to the phone, turn on the automatic heart rate detection function, set the measurement frequency to 30 minutes; receive and display the notification; set the alarm; start the app to synchronize the data once a day, which is considered moderate use, the remaining power was 52% (out of 58%), consuming only 6% of the power.
At this rate, with the same settings, Mi Band 4 (NFC version) can last up to 15 days. However, the standard version consuming less power without any NFC chip can last up to 20 days.
Continued to Page 6 (Pros & Cons, Our Verdict, Price & Availability)