Step Tracking, Heart Rate and More When it comes to comparing fitness trackers, the decisive factors are going to be the features that the fitness band comes with. While the Mi Band 3 users think of upgrading to Mi Band 4, one of the important questions would be whether or not the Mi Band 4 would offer better features. On this front, although there are a lot of overlapping features between the two bands like show SMS, message notifications, call, track-activity, locate the phone, track steps, vibrating alarm and heart rate monitor. Both of these bands are also water-resistant up to 50m, but the Mi Band 4 is a little ahead with its activity type tracking and swimming style tracking. Not only this, but the Mi Band 4 also comes with Xiao AI voice assistant allowing the users to control features like setting schedules, play music and more. Display The display is one of the major areas where the Mi Band 4 truly shines in comparison to the Mi Band 3. While the Mi Band 3 comes with a 0.78-inch OLED touchscreen display with an 80×128 pixels resolution, the Xiaomi Mi Band 4 comes with a 0.95-inch colour AMOLED display with 120×240 pixels resolution. There is also a 2.5D glass protection on top. The Mi Band 4 also have colourful 77 watch faces which are also customisable, making it one of the plus points of owning the Mi Band 4. Battery Life Battery life is another one of the criteria which will decide whether or not the Mi Band 4 will be a worthy upgrade. So, the Mi Band 3 sports a 110mAh battery, the Mi Band 4 comes with a slightly larger 135mAh battery. The Mi Band 3 will last 15 to 20 days on moderate usage, but as per Xiaomi’s claims, the Mi Band 4 would last 20 days. Nonetheless, it is quite possible that you will have to pull out the charging cradle twice in a month. Comparing the prices of these two fitness bands, there is a slight difference. The Mi Band fashions a Rs 1,999 price tag, but the Mi Band 4 comes for Rs 2,299. However, if you are already using the Mi Band 3 and you are thinking of upgrading to the Mi Band 4, there are some things that you must know. If a good display, a slightly better battery life and precision tracking are your main needs from a fitness tracker, then the Mi Band 4 would be a worthy upgrade. But, in case you are a minimal user of the fitness band, then you will find that on most days, the Mi Band 3 will suffice as your wrist companion.