Xiaomi Mi Band 5 — One of the most popular fitness bracelets on the market, but even such a reliable device requires repair over time, and most often users are faced with the need to replace the battery, which is used in the process of repairing the device. 2-3 And in a year of heavy use, it starts to discharge or swell quickly. 5 — the task is not simple: the manufacturer did not provide service hatches, and the body is glued tightly to protect electronics from moisture and dust.
In this article, you will find step-by-step instructions with photos, video guides, a list of necessary tools and unique tips from repairmen to help avoid errors. We will also tell you which parts can be replaced yourself, and in which cases it is better to contact the service center. If you decide to disassemble, be careful: one wrong movement can lead to damage to the plumes or display.
Preparation for disassembly: tools and security measures
Before you start disassembling the Mi Band 5, make sure you have everything you need. Without the right tools, the risk of damage to the body or internal components increases dramatically.
- 🔧 Plastic mediators or shoulder blades (thickness 0.2-0.4 mm) - for careful smearing of the body.
- 🔥 Dryer or thermo-air station (up to 300 power)°C) - for softening the glue.
- 🧲 Magnetic screwdriver. T3 or T4 — to unscrew the screws (if any in your modification).
- 📦 Small suction cups (optional) – help lift the screen after heating.
- 🧴 Isopropyl alcohol (90%+) — glue-residue.
- 🔋 New battery (if you are planning to replace) – check compatibility with the model XMSH10HM.
Important: Mi Band 5 doesn't have official self-repair support, so you do everything at your own risk. If the bracelet is still warranty, disassembly will cancel it. IP68 will be disrupted and the device will become vulnerable to moisture.
⚠️ Warning: Do not use metal tools (knives, screwdrivers) to smear the body - they scratch the plastic and can damage the plume of the display. If the glue is too strong, do not apply excessive force: it is better to repeat the heater with a hairdryer.
Step 1: Removal of the strap and preparation of the body
The first step is to separate the strap from the main module, and the Mi Band 5 uses a quick-removal mechanism, but many users mistakenly try to pull the capsule by breaking the latches.
- Place the bracelet on a flat surface with the screen down.
- Find a small button on the back of the module (it is located closer to the edge, on the charging contacts side).
- Press the button before clicking and pull the capsule upwards - it should easily exit the strap.
If the button doesn't press or the capsule doesn't pull out, don't force it! There may be dirt in the mechanism, in which case, clean the latch carefully with a toothpick dipped in isopropyl alcohol.
After removing the strap, inspect the body for visible damage (cracks, dents). If any, disassembly can be complicated. Also check if the battery will rise, as you can see from the raised lid on the charging contacts. A bloated battery requires special care: it can not be pierced or bent!
☑️ Preparation for the disassembly of Mi Band 5
Step 2: Heating and separation of the front panel
The most important step is to separate the touchscreen from the back cover, and the manufacturer uses double-sided tape. 3M It's a high-strength, almost impossible to remove at room temperature:
- Set the hair dryer at a temperature of 250-280°C (if there is adjustment) and direct the airflow to the edges of the case (not on the screen!).
- Heat in a circle for 1-2 minutes, evenly warming the glue.
- Try to gently tamper with a plastic mediator, starting at the bottom edge (on the charging contacts side). If you don't, warm up for another 30 seconds.
Once the mediator enters the gap by 1-2 mm, slowly lead it along the body, separating the front panel. Take your time! If you hear a crunch or crack, stop immediately: it may be damage to the display plume.
⚠️ Warning: Do not heat the bracelet for more than 3 minutes in a row - this can damage the battery or electronics. If the glue does not respond, take a break for 5 minutes and repeat the heating.
Once you've separated the front panel, you'll see a flexible plume of the display that connects the screen to the board. It can't be pulled or bent! In some versions of the Mi Band 5, the plume is glued to the board, in which case, gently tuck it in with a plastic blade.
What to do if the screen does not separate?
Step 3: Disconnect the battery and board
Once you remove the front panel, you'll have access to the insides of the bracelet, and the main board is in the center, and the battery is underneath. The Mi Band 5 uses a 125 mAh lithium polymer battery (model). BL125 Or similar. To get it out:
- Carefully tuck the battery with a plastic blade, starting at the top edge (opposite to charging contacts).
- If the battery is glued, warm it with a hair dryer on the back side (temperature not higher than 200).°C!).
- Disconnect the power connector from the board – it is usually white and located next to the chip.
Importantly, if the battery is blown up, don't pierce it or bend it! This can lead to fire. Bloated batteries require special care: they are better removed in protective gloves and on a non-combustible surface.
Once the battery is removed, you can start to inspect the board, and it has:
- 📱 Display controller (usually under a metal screen).
- 🔋 Charging chip (near the contacts).
- 📡 Bluetooth antenna (thin track along the edge of the board).
- 💡 Vibration motor (small black cylinder).
| Component | Location. | Typical malfunctions |
|---|---|---|
| Battery | Under the charge, from the charging contacts | Bloating, fast discharge, lack of charging |
| Display plume | Connects the screen to the board | Breaks, damage to contacts (leads to vertical stripes on the screen) |
| vibratory motor | At the top of the board | No vibration at notifications |
| Charging chip. | Near the contacts. | The bracelet is not charged or is defined as an "unknown device" |
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If you are planning to replace the battery, check the voltage with a multimeter before installing the new one. Normal value for the Mi Band 5 is 3.7-4.2 V. If the voltage is below 3.5 V, the battery may be discharged or faulty.
Step 4: Diagnostics and replacement of components
Now that the bracelet is disassembled, we can diagnose and replace the defective parts, and we'll look at some of the most common problems and how to fix them.
1.The bracelet is not charged
Reasons:
- 🔌 Oxidation of charging contacts - clean them with alcohol and eraser.
- 🔋 Replace the battery with a new one (model) BL125 analogue).
- 📱 Problems with charging chip - requires soldering (it is better to contact the service).
2.The screen does not respond to touch
Possible causes:
- 🖥️ Display plume damaged - check the integrity of contacts.
- 💧 Getting moisture under the screen – dry the bracelet in rice or silica gel for 24 hours.
- 🔧 Detachment of the touch layer - requires replacement of the display.
3.The bracelet is not synchronized with the phone
What to do:
- 📡 Reset the settings via Mi Fit → Device profile → Drop it.
- 🔄 Reinstall the application and re-couple the bracelet.
- 📱 Check the Bluetooth antenna on the board - the contact may have gone away.
If you are replacing a battery, make sure that the new cell is the same size and capacity. Using a larger battery (for example, 150 mAh instead of 125 mAh) can lead to overheating or bloating due to a mismatch in charging currents.
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The most common mistake when replacing a battery is the wrong polarity of the connection. In the Mi Band 5, the red wire is the same as the red wire"+", And black is, "-." If you mix them up, you can burn the board!
Step 5: Build the bracelet after repair
The Mi Band 5 build requires as much care as disassembly. Follow these guidelines to avoid problems:
- Check all plumes and connectors - they should be tightly connected, without distortion.
- Put the new glue on the edge of the case. Double-sided tape will do. 3M 9448 or glue B-7000 (thin-layer!).
- Carefully connect the front panel to the back cover, starting at the charging contacts side. Make sure the screen is up straight, without gaps.
- Secure the body with clamps or rods for 10-15 minutes so that the glue grasps.
After assembly, do not turn on the bracelet immediately - let the glue dry (at least 1 hour).
- 🔋 Does the charger work (plug in to the charger).
- 🖥️ Does the screen react to touch.
- 📡 Is the bracelet synchronized with the phone.
⚠️ Attention: If the bracelet does not turn on after assembly, check: 1. Correct battery connection (polarity!). 2. Integrity of the display plume. 3. Short circuit on the board (you can check with a multimeter in the "vertebral" mode").
If everything works, congratulations, your Mi Band 5 is ready for further use, but remember: after self-repair, the water protection system is ready for further use. IP68 No longer guaranteed. Avoid water and heavy humidity.
Frequent Mistakes and How to Avoid Them
Even experienced craftsmen sometimes make mistakes when disassembling the Mi Band 5, and here are the most common mistakes and ways to prevent them:
- 🔥 Overheating of the body with a hairdryer - leads to deformation of the plastic or damage to the battery.°C and heat in short intervals.
- 💥 Sharp separation of the screen can break the plume of the display. Solution: Push the case slowly, checking resistance.
- 🔋 Using a non-original battery — cheap ones quickly fail or swell. Solution: buy batteries from trusted sellers (for example, buy batteries from trusted sellers, BL125 from Xiaomi or ATL).
- 💧 So, if you get glue on the contacts, you can short circuit. Solution: just apply glue to the edge of the case, avoiding the internal components.
- 🔧 Loss of screws or springs - some Mi Band 5 versions have screws that are easily lost.Solution: work on a white napkin to notice the fallen details.
If you are in doubt, you should contact a service center. The average cost of replacing the battery in the Mi Band 5 is 800-1500 rubles (2026), which is comparable to the price of a new bracelet. However, self-repair can be justified if you want to save data (for example, training statistics) or are tied to a specific device.
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If the bracelet is rapidly discharged after repair, check the resting current using the Mi Fit app. Normal is 1-3% per hour. If the discharge is faster, there may be a short circuit somewhere or the battery is defective.
Video Instructions and Additional Resources
For clarity, we recommend you to read the video guides for disassembling the Mi Band 5. Here are the verified sources:
- 🎥 YouTube: "Xiaomi Mi Band 5 Full Disassembly" (Repair Guide) - detailed analysis with comments in English.
- 🎥 "Replacement of the battery Mi Band 5 with your own hands" (channel Chinim Sami) - Russian instruction with tips on soldering.
- 📄 Forum 4PDA: Renovation of Mi Band 5 – discussions, schemes and recommendations from users.
If you are looking for a fee scheme or plume pinning, they can be found on specialized sites, for example:
- ZXD Forum (Section of Xiaomi Wearables).
- BadCaps (in branches for repair of wearable electronics).
Before starting work, it is also useful to study the datasheets on the key chips of the bracelet.
- Charge Controller – Usually BQ25105 or similar.
- Bluetooth chip - Nordic nRF52832.
This data will help in the diagnosis of faults at the component level.