How to charge the fitness bracelet Xiaomi Mi Band 4: video + step-by-step instructions

The Xiaomi Mi Band 4 fitness bracelet remains one of the most popular activity-tracking gadgets, despite the release of new models. Its reliability and functionality are time-tested, but even such a simple device has nuances — especially when it comes to charging. Many users face problems: the bracelet does not charge, the indicator does not burn, or the battery goes down too quickly. In this article, we will analyze all the ways of charging, show video instructions and tell you how to avoid typical errors.

The Mi Band 4 is a compact design and magnetic charger, and if you first encounter this type of connection, it may not seem obvious, and over time, contacts get dirty and the cable wears out. We've compiled up-to-date data for 2026, including tips for care and troubleshooting, and at the end of this article, answers to frequent questions and useful life hacks to extend battery life.

1.Preparation and preparation for charging

Before you start, make sure you have everything you need. The standard set of Xiaomi Mi Band 4 includes:

• 🔋 The fitness bracelet with the strap itself
• 🔌 Magnetic charger (cable with a magnetic charger) USB-plug-in)
• 📄 Short instructions (usually in several languages, including Russian)

If you lost the original cable, you can use compatible analogues, but there are nuances. Cheap Chinese substitutes often have unstable voltages, which can damage the battery. You should choose certified accessories labeled Mi Band 4 or universal charging for the Mi Band 3/4/5.

Also prepare:

• 💻 Laptop, computer or power adapter with USB-port (5V/1A or 5V/2A)
• 🧴 Wet wipes or cotton swabs to clean contacts
• 🔍 Lupa (optional, if you need to inspect contacts for oxidation)

⚠️ Note: Do not use chargers with an output current greater than 2A – this can reduce the battery life of the Mi Band 4. The best option is the original adapter from the Xiaomi smartphone or certified Power Bank.

2. Step-by-step instructions: how to charge the Mi Band 4 correctly

The charging process seems simple, but many users make mistakes in the first step, which is to connect the cable incorrectly.

1. Take the bracelet off your hand and unplug the capsule from the strap, and pull it toward the screen, and it will jump out of the grooves easily.
2. Clean the contacts on the back of the capsule and on the charger. Use a dry cotton swab or soft cloth. Never use alcohol or acetone - these can damage the protective coating of the contacts.
3. Connect the magnetic cable to USB-Make sure the connector is tightly inserted, without backlash.
4. Attach the capsule to the charger. The magnets should be pulled in with a characteristic click. If that doesn't happen, check the polarity -- there's a tag on the cable. + and −, which must match the marking on the bracelet.
5. Wait for the indicator to come up. The Mi Band 4 will show a battery icon with an animation of charging. If the indicator doesn't burn, try reconnecting the cable or using another one. USB-port.

The full charge time is 1.5-2 hours. Do not leave the bracelet on charging for more than 3 hours, this can lead to overheating of the battery.

Video Instructions: Visual Guide

If the text instruction seems complicated, we recommend watching the video. We have selected 3 verified videos from different angles:

And you can see the error-detection video, which shows real cases where users have misconnected the cable or used damaged wires, for example, if the magnets don't stick, it could be a strain of the contacts or a dust ingress.

It's also useful to see the Mi Band 4 disassembly videos, which show you how the battery works and why you can't drop the bracelet while charging, and the battery is non-removable and requires soldering work to replace it.

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If the video is in English, turn on subtitles and automatically translate through YouTube settings. To do this, click on the gear icon → Subtitles → Autotranslation → select Russian.

4. Frequent problems and their solutions

Even with the right Mi Band connection 4 It might not charge.-5 causes and ways of eliminating them:

• 🔌 The cable is faulty - try another one USB-port or check the integrity of the wire.USB-plug.
• 🔋 Contacts are oxidized — clean them with a brush or a soft brush. If the oxidation is strong, use isopropyl alcohol 90% (only for contacts, not for the entire bracelet!).
• 📱 Software problems — sometimes the bracelet will freeze and not show charging, in which case the reset will help: connect to charging and hold the touch button for 10 seconds.
• 🔥 Battery overheating – if the bracelet is hot, let it cool for 15-20 minutes before charging.
• 🔄 Unoriginal cable -- some cheap ones have the wrong polarity. + and − bracelet.

If none of these methods worked, the battery itself may have failed, in which case you should contact the service center, and the average cost of replacing the battery in the Mi Band 4 is 800-1500 rubles (2026).

⚠️ Warning: Don't try to disassemble the bracelet yourself without experience! Inside, glue joints and brittle plumes are used. Inept repairs can lead to complete breakdown.

5.How to extend the life of the battery: tips for care

The average battery life in the Mi Band 4 is 2-3 years when used properly. To keep the battery longer, follow these guidelines:

• 🔋 Avoid full discharge - try to charge the bracelet at 20-30% charge. Deep discharge reduces the life of lithium polymer batteries.
• ☀️ Do not leave it in the sun – overheating above 40°C damages the battery. Same goes for cold: don't use the bracelet in lower temperatures. −10°C.
• 🔌 Use the original cable – cheap analogues can give unstable voltage, which leads to accelerated battery degradation.
• 📵 Turn off unnecessary functions, such as a permanent pulsemeter or notifications from messengers, this will reduce power consumption by 15-20%.

It's also helpful to calibrate the battery once a month: completely discharge the bracelet, then charge to 100% without interruption, which helps to reset the power controller errors.

If you notice that the bracelet has become discharged in 1-2 days (with normal use), this is a sign of battery wear, in which case only a replacement will help.

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Optimal charging mode for battery durability: connect at 20-30%, disconnect at 80-90%. Full cycle (0-100%) should be done no more than 1 time per month.

6. Alternative charging methods

If you don't have the original cable, you can use alternative methods, but remember, they're less safe and can damage the bracelet if you don't connect properly.

Method 1: Universal charging for the Mi Band

There are also magnetic cables with USB-C or Micro-USB connector that are compatible with several bracelet models, and the main thing is to check that the contacts match the Mi Band 4 (the distance between the pins is 4.5 mm).

Method 2: Charging from Power Bank

You can connect the bracelet to an external battery, but make sure it delivers a stable 5V/1A. Some cheap power banks have power surges, which is dangerous for a small battery bracelet.

Method 3: Homemade adapter (for experienced)

If you're an electronics expert, you can weld an adapter from an old phone charger.

+ (plus) → Red wire (VCC)




− (minus) → Black wire (GND)

But we don’t recommend this method to beginners – a mistake in polarity will lead to a short circuit!

7. Comparison with other Xiaomi models

If you’re thinking about moving to a new model, it’s helpful to compare the Mi Band 4 with more modern bracelets in terms of charging options:

As you can see from the table, the Mi Band 4 is outperforming the new models in terms of charging speed and battery capacity, but its main advantage is reliability and time-tested design, unless you need additional features (e.g., battery capacity, SpO₂ In Mi Band 6, the four are still a great choice.

FAQ: Answers to Frequent Questions