Xiaomi Mi Band 4
20 days
1-3 days
In this article, we will look at all possible causes of rapid discharge, from trivial errors in settings to hidden hardware defects, learn how to diagnose a problem, which parameters to check first, and what to do if the bracelet discharges even after resetting to factory settings. Special attention will be paid to the unique nuances of the Mi Band 4, which are not found in other models of the series (for example, the influence of the new model). AMOLED-screen or firmware features 1.0.9.54).
Now, if your bracelet runs out in less than 12 hours, it's almost always a hardware malfunction (most often a bloated battery), and otherwise you can solve the problem software-based. Let's start with the simplest one.
1. Checking basic settings: what to turn off first
Most users do not even realize that the standard features of the Mi Band 4 can eat before 30-40% The first thing you need to do is turn off the energy-consuming options that you don't need.
Go to the Mi Fit app (or Zepp Life for newer versions) and check the following options:
Turn off the permanent screen lighting|Reduce the brightness to 20-30%|Turn off notifications from unnecessary applications|Turn off automatic sleep detection|Remove vibrations when notifying-->
The most voracious functions (in decreasing effect on the battery):
- 🔦 Constant screen illumination (AMOLED It consumes energy even in a static image. → Display. → Illumination.
- 📱 Notifications from messengers (each notification) = vibration + Leave only the important ones (calls, SMS).
- 🌙 Automatic sleep monitoring (the bracelet actively scans the pulse at night). → Sleep settings.
- 🏃 Continuous pulsemeter (measurement each) 1-5 chunks up 25% Transfer to Manual mode in Settings → Heart monitoring.
After these changes, autonomy should be increased. 30-50%. If the bracelet is still discharged too quickly, we proceed to the diagnosis.
Every one. 2-3 day-day|Once a week.|Once 2 weekdays|Less than once 2 weekdays-->
2. Software failures: firmware, synchronization and hidden bugs
Mi Band 4 He is known for his "childhood illnesses" in firmware, especially in versions. 1.0.7.xx and 1.0.9.xx. One of the most common bugs is endless synchronization with the phone, because of which the bracelet does not go into sleep mode and discharges behind the phone. 6-12 hours.
How to check:
- Open Mi Fit and look at the sync indicator at the top of the screen. If it's spinning all the time, it's a bug.
- Check the firmware version of the bracelet in Profile → About the bracelet. Current for 2026 - 1.0.9.54 (or newer).
- Install the Notify & Fitness for Mi Band app and check the connection log, and if there are hundreds of sync attempts per hour, the problem is confirmed.
Decisions:
- 🔄 Reconnect the bracelet: In Mi Fit, remove the device (Profile) → On the bracelet, reset: Settings → Reset (press the touch button for 10 seconds). Connect again, but do not restore data from the backup - this can carry the bug.
Update the firmware manually
How to Switch Mi Band 4 Manually?
If after these manipulations the discharge remained - the problem may be in the hardware.
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Before firmware, turn off automatic updates in Mi Fit (Settings) → The bracelet. → Auto Update to avoid re-downloading the problematic version.
Hardware malfunctions: battery, contacts, moisture
Mi Band 4 battery-powered 135 mAh (model) XMSH07HM) or 125 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh (XMSH08HM). In normal operation, it must be 15-20 If the bracelet is discharged, then 1-2 Even after a day of resetting, it’s almost always a hardware problem.
Top.-3 hardware:
| Reason. | Symptoms | Decision |
|---|---|---|
| Bloated battery | The bracelet is discharged for 3-6 clock, the body is slightly inflated, the screen may move away from the body. | Replacement of the battery (cost) ~500-800 ₽). Do not use a bracelet with a bloated battery - the risk of fire! |
| Oxidation of contacts | Charging is only in a certain position, the bracelet can be turned off when vibrating. | Cleaning contacts with alcohol + Replace the charging cable. If it doesn't work, weld the contacts. |
| Moisture intrusion | The bracelet discharges unevenly (for example, 50% per hour, then slowly), artifacts on the screen are possible. | Drying in rice/silica gel 24-48 If it doesn't work, it's a payroll cleaning and dismantling. |
How to check the battery without disassembling:
- Completely discharge the bracelet (before switching off).
- Connect to charging and record the time to 100%. Norma — 1.5-2 If you charge for an hour, 20-30 minutes - the battery degraded.
- After charging, turn off USB And look at the discharge schedule in Mi Fit. Abrupt jumps (e.g., from 100% to 80% in 10 minutes) indicate a malfunction.
⚠️ Warning: If the bracelet heats up when charging or working, stop using immediately! This is a sign of short circuit in the battery.
4. The Impact of Third-Party Apps and Firmware
Many users install custom firmware (such as the Amazfit Mod or Custom Mi Band 4) to expand functionality, but such firmware often contains bugs that prevent the bracelet from going into sleep mode.
Signs of broken firmware:
- 📉 The bracelet discharges evenly but too quickly (e.g. 10% per hour).
- 🔄 The screen does not go out after inactivity (even if the backlight is turned off in the settings).
- 📱 Mi Fit app shows Error 10003 or Error 5000 sync error.
How to return the original firmware:
- Download the official firmware for your model from the forum MIUI.
- Install Mi Fit version 4.6.0 (new versions block downgrade).
- Place the firmware file (.fw) in the Mi folder Fit/firmware.
- In Mi Fit, click "Update firmware." The bracelet should detect the file and suggest installation.
If you have a problem after you return to stock firmware, check compatibility with your phone. Xiaomi/Redmi (particularly MIUI 12-14) They are in conflict with the Mi Band. 4 due to optimisation of energy consumption.
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Custom firmware can add new features, but almost always reduce autonomy on the Internet. 30-50%. If you need a battery, use only official software.
5 External factors: temperature, magnetic fields, mechanical damage
Few people know, but Mi Band. 4 It's sensitive to environments, such as low temperatures (below). +5°C) may reduce autonomy in 2-3 times, and magnetic fields (for example, from wireless charging of the phone) – cause false alarms of sensors.
Factors that kill the battery:
- ❄️ Cold: At -10°C battery capacity drops on 50%. If you wear a bracelet in winter, take it off or put it under your clothes.
- 🧲 Magnetic fields: Do not place the bracelet near speakers, wireless charges or magnets. this can cause a constant activation of the compass.
- ☀️ Direct sunlight: AMOLED-Mi Band 4 screen burns out and loses contrast, and overheating accelerates battery degradation.
- 💥 Blows and vibrations: If the bracelet is frequently knocked (for example, when running), the battery contacts may be gone.
How to check the impact of external factors:
- Remove the bracelet and put it in a warm place (such as next to the battery) for 12 hours. If the discharge has slowed down, the temperature is a problem.
- Turn off all notifications and leave the bracelet on the table, and if it's still discharged quickly, it's not the software, it's the hardware.
- Check the case for cracks or gaps, and if there are, moisture could have gotten inside.
⚠️ Note: If the bracelet has been in water (even if it is waterproof according to the 5 standard) ATM), After drying, check the touch button. Moisture entering the screen can cause false presses and discharge.
Alternative diagnostic methods
If standard methods did not help, try advanced diagnostics with third-party tools.
Ways of deep verification:
- 📊 Battery Log via Mi Band 4 Tools: Install the Mi Band 4 Tools (Android) app. Connect the bracelet and go to Battery Stats. See the discharge schedule. Sharp jumps indicate short circuit, smooth jumps indicate software problems.
Multimeter battery test
How to check the battery multimeter?
If after all the checks the cause is not found, the last option remains – hardware reset (not to be confused with a regular reset!).
Extreme measures: hardware reset and replacement of components
If the bracelet is discharged in a few hours and no software methods help, it is likely that the power controller or the battery is to blame, in which case only disassembly and replacement of components will help.
Step-by-step instructions for hardware reset:
Disconnect the bracelet from the phone in Mi Fit|Completely discharge the battery (before switching off)|Connect to charging and hold the button for 30 seconds|Disconnect from charging and reconnect (repeat 3 times)|Reset your settings via Mi Fit-->
If the hardware reset didn't work, you're left with a battery or board replacement.
- 🔋 Battery replacement: 500-800 ₽ (alone or 1000-1500 ₽ (service).
- 🔧 Replacement of food costs: 1500-2000 ₽ (service-only).
- 🆕 Buying a new bracelet: from 2500 ₽ (b/y) up to 4000 ₽ (new).
Where to buy spare parts:
- 🛒 AliExpress (batteries from 300) ₽, long wait).
- 🏬 Beru or Ozon (delivery) 2-3 day-to-day).
- 🔧 Local services (search for "Mi Band 4 Repair]").
⚠️ Note: When replacing your battery, use only original or certified batteries (for example, GMB03 or GMB04). Cheap analogues may swell or not hold the charge.
8 When to buy a new bracelet instead of repair
The Mi Band 4 is a good repair if:
- 💰 The cost of repairs does not exceed 30-40% from the price of a new bracelet.
- 🔋 The problem is only the battery (replacing it is simple and cheap).
- 📱 I like the design or functionality of this particular model.
In which cases is it better to buy a new one:
- ⚡ Bracelet discharges in less than 6 hours (probably a problem with the food bill).
- 💧 Water corrosion caused contacts to corrosion (repairs will be expensive).
- 📉 There are more modern models on the market (for example, Mi Band 7 or Mi Band 8) with better autonomy.
Comparison with new models:
| Model | AKB capacity | Autonomy (real) | Price (2026) |
|---|---|---|---|
| Mi Band 4 | 125-135 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh | 7-14 days | 2500-4000 ₽ |
| Mi Band 6 | 125 mAh | 10-16 days | 3500-5000 ₽ |
| Mi Band 7 | 180 mAh | 12-20 days | 4500-6000 ₽ |
| Mi Band 8 | 190 mAh | 14-25 days | 5500-7000 ₽ |
If you decide to upgrade, look out for the Mi Band 8 – it not only has a larger battery, but also a more energy-efficient processor. DA14705), It uses 30% less energy than the Mi Band 4.
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If you have a Mi Band 4 served more 2 In the years since, the battery is probably overdone. 60-70%. In this case, the replacement will cost less than buying a new bracelet, but the autonomy will still be lower than that of a fresh model.