Mi Band 3 :The price & features, you all know it, no need to write again.About the pros and cons, there are tons of reviews in Amazon and YouTube. Go and check them.I've been using the Gadget for more than a month & what i'll be writing is about the battery life...• The company claims it can withstand 20 days, but it is not impossible. With all the features turned off, and only using it as a digital watch, I think it can survive for 15-20 days. (Lasted for 23 days max for me)• With all the features turned on, 24 hr heart rate sensing, some behavior tagging (you'll find it in Mi fit app), Sleep Monitoring turned on, and all those Notification, Call, Alarm etc; i mean EVERYTHING TURNED ON which drains Your Battery; the Mi Band 3 ran a disappointing 1 day earlier. But after a recent update Mi have increased the frequency of HR detection to 10 min interval which increases the Battery life to 3 days as for me.• With moderate use, the Heart Rate Sensor turned off, but Sleep Monitoring turned on (which measures your Heart Rate while sleeping), and my 1 hr Workout (during Exercise Mode the band measures your Heart Rate & Calories Burnt Continuously); the Mi Band 3 served me for about 2.5-3 days earlier. (Cannot comment on this after this update)• With just a casual use, with simliar features from the previous point and the Sleep Monitoring Turned Off; it may go around 10-15 days.P.S. -° On an average I wear the Mi Band 3 for about 20+ hrs a day with 10+ hrs Connected with my Smartphone to the Mi Fit App, via Bluetooth.° The Pedometer (3-Axis Accelerometer in this case) which counts your Steps & Distance traversed, & the Sleep Assistant (which measures the hours you slept) can't be turned off, they run 24×7.° I use the Night Mode from Evening.Conclusion :•If You are a Casual User, The Mi Band 3 will serve You 15+ days in a Single Charge.• I'm a Moderate User, and it goes about a week for me.• For Heavy Users, the Mi Band 3 might run max 2-3 days.These are completely my Personal Opinion, based on my Personal Experience. I apologise for any Controversy.Here is a Blog from Mi Store :Mi Band 3 comes with a 110mAh Li-Ion Polymer Battery that can give up to 20 days of battery backup with routine use.Automatic Heart Rate Monitoring -This feature measures heart rate at the user set frequency intervals. For increased accuracy the algorithm measures Heart rate at a higher frequency when a movement or activity is detected. Additionally, when a user is asleep the heart rate is measured at a frequency of 2 min to give an accurate resting Heart rate result. These features consume very high battery and leads to an average life of 1 - 3 days.Sleep Assistant -Sleep assistant function helps in accurately measuring the sleep. Use this feature only if the Mi Band 3 is unable to detect your sleep tracking as it uses higher battery power.To achieve more battery life it’s recommended to use these features whenever it’s required.DescriptionExpected Battery Life*Light UsageMedium UsageExtensive UsageWith Automatic Heart Rate Monitoring - OffUp to 20 days15 - 18 daysUp to 10 daysWith Automatic Heart Rate Monitoring - On2 - 3 daysUp to 2 daysUp to 1 day*These results are under test conditions. Actual usage may vary.Mi Band 3 usage has been divided into 3 categories. Here's how you can make the most of Mi Band 3 battery depending on the kind of user you are.Casual Usage : Up to 20-days battery lifeCasual usage is when users generally use Mi Band 3 for step & sleep tracking. These users have activated limited app notifications.Check time on the Band – 10 times per dayCall Alerts - 5 calls per dayHeart rate monitoring – 2 times per dayApp notification alerts (WhatsApp or other apps) - 20 notifications per dayOther operations on Band - 5 min per dayMedium Usage : 15 – 18 days battery lifeMedium usage accounts for getting call & notification alerts and actively tracking the step count, sleep quality, heart rate and calorie burn.Check Time on the Band – 20 times per dayGet Call Alerts - 10 calls per dayHeart rate monitoring – 5 times a day.App notification alerts (WhatsApp or other apps) - 30-50 notifications per dayReal-time activity tracking – 1 hour per weekOther operations on Band display - 15 min per dayExtensive Usage : Up to 10 days battery lifeExtensive usage is when users are into heavy fitness regime and mainly use Mi Band 3 for tracking their activities and Heart rate.Check Time on the Band – 30 times per dayGet Call Alerts - 15 calls per dayHeart rate monitoring – 10 times per dayApp notification alerts (WhatsApp or other apps) - 50+ notifications per dayReal-time activity tracking – 2 hours per weekOther operations on Band display - 20 min per dayHope this will help you get most out of your battery life in your Mi Band 3.Thanks
First of all this is a must upgrade for Mi2 band users. I used Mi2 for six months and was quite happy with that too. But this one seems like a two version improvement over Mi2. It is definitely a great band for first time buyers as well. I'll list the details here as well as compare with Mi2.1. Looks are better - Mi2 seemed like a generic product but this one looks pretty good. The front glass is pretty well designed and is very smooth which makes it look a bit high end. Even the toggle button looks pretty good. Toggle is made like a smooth depression instead of a rugged one in Mi2. This complements the glass look very well.2. Glass tensile strength is better - Not to say Mi2 was bad but is even better. If you usually bang the band, not badly though, on walls or doors Mi3 is much better to endure all that. Mi2 started giving up after 1-2 months and i could see a few scratches. This one is holding up pretty well.3. Much better battery life - This one easily lasts for a couple of weeks. I would recommend not going by 20 day number that the company is claiming. However, actually you need the band to survive at least a week so that you can easily charge it on the weekend and this one is pretty good at that. Mi2 used to last 4-5 days with heavy use.4. Great display - Clearly one thing is a big positive. The display is much better with the OLED screen. Sharp and crystal clear. Shows up more information in the same amount of space as well. This is another significant improvement over Mi2 and most other bands in the similar range.5. Expansive set of notifications - Mi has added more set of notifications in this (whatsapp too) and that clearly helps. What is another great feature is that you can reject calls from the band. This was an irritating factor in Mi2 band. If you are on a treadmill and the phone is ringing, you would have to bear the entire ringing on Mi2. This is a small but a very meaningful functionality that you will appreciate over time.6. Better algorithms - Frankly, I was a bit upset with my Mi2. I felt the step count accuracy was somewhat +/- 40% which is not good at all. This one is much more accurate than Mi2 and at the same time it is quite comparable to some high end brands which run at 10% error rate. These new algos in this watch are great. Wish Mi pushes these algos as software update to Mi2 as well unless this requires a different set of hardware sensors.7. Heart rate monitor is more accurate - I compared it with a friend's apple watch and WOAH, the heart rate was similar. So that's another great improvement in the band. Better sleep monitor as well.8. Other improved features - much better water resistance. I take it for swim now. Better design and strong strap as well.VerdictAt this price, frankly you can't get a good branded, good looking and more accurate band. And something which syncs well with a good app that Mi has. If you are newbie then start with this one. If you are a Mi2 user, you need to upgrade for sure.