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.
Upgraded battery from 110mAh to 135mAh
Larger AMOLED screen takes more battery
NFC version has the same battery capacity and takes more power
15 days on NFC version (wrist lift, continuous heart rate, 30 minutes interval, once a day synchronization, Auto HR detection, alarm set once, notification update, )
20 days on non-NFC version (same settings)
Continued to Page 6 (Pros & Cons, Our Verdict, Price & Availability)