How to charge Xiaomi Mi Band 4: instructions, tips and frequent mistakes

The Xiaomi Mi Band 4 fitness bracelet remains one of the most popular wearables due to its combination of functionality, compactness and affordable price. However, even such a simple device requires proper handling, especially when it comes to charging. Failure to follow basic recommendations can lead to rapid battery wear, malfunctions or even breakdown.

In this article, we will learn how to charge the Mi Band 4 without risk to the device, from the choice of charging cable to the nuances of the process, which are often not mentioned in official instructions. You will also learn how long it takes to fully charge, how to understand that the battery is charged, and what to do if the bracelet does not respond to the connection to the network.

Preparation for charging: what to check before connecting

Before you connect the Mi Band 4 to the power supply, make sure you follow a few key steps to avoid problems like slow charging or damaging the contacts.

First, check the charging cable. The Mi Band 4 uses a proprietary connector that is not compatible with other devices. If you lose the original cable, don't try to plug the bracelet in through the universal. USB-Cables can damage contacts. Get a certified counterpart from Xiaomi or trusted manufacturers.

• 🔌 Check the integrity of the cable: whether there are inflections, bare wires or traces of oxidation on the contacts.
• 📱 Make sure the bracelet connector is clean, and dust or sweat can interfere with tight contact.
• 🔋 Use a power adapter with output current 5V/1A or 5V/2A. More powerful charging (for example, from smartphones) will not damage the bracelet, but will not speed up the process.

Remove the bracelet from your hand to prevent accidental touch-screen pressing while charging and reduce the risk of moisture on your contacts. If you exercise or are in the rain, wipe the body with a dry wipe.

Step-by-step: how to connect Mi Band 4 to charging

The charging process of Xiaomi Mi Band 4 is as simple as possible, but there are nuances that many people are not aware of.

1. Remove the bracelet capsule from the strap, pull it in the opposite direction to the buckle until you hear a slight click.
2. Find two metal contacts on the back of the capsule, symmetrically side by side of the central sensor.
3. Connect the charging cable to the capsule.The connector should fit tightly to the contacts - if it dangles, try flipping the cable (sometimes users confuse the top and bottom).
4. Connect the other end of the cable to USB-port of the power adapter or computer, the bracelet should display a charging animation (lightning battery icon).

If the animation does not appear, check:

• 🔌 Connector density (sometimes helps by lightly pressing down the cable).
• 🔄 Possibility of work USB-Port (Try another port or adapter).
• 📵 Cleanliness of contacts (wipe them with a cotton swab soaked in alcohol).

Important: Mi Band 4 does not support wireless charging, and any attempt to use Qi chargers will damage the battery.

How long does the Xiaomi Mi Band 4 charge?

The full charging time of the Mi Band 4 depends on several factors: current charge level, cable quality and power source, which takes an average of 1.5 to 2.5 hours.

When you're done charging, you have a 100 percent battery icon on your bracelet screen, and then you can turn off the cable, and you can recharge the device, because it's not too hard to do, but you shouldn't leave the bracelet on charge for more than 12 hours at a time, because it can cause the contacts to overheat.

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If the bracelet is charged for more than 4 hours, check the cable and adapter. the current may be lower than necessary (should be at least 0.5A).

Fun fact: The Mi Band 4 supports fast charging in the first 30 minutes, which is about 50% battery recovery time, which is convenient if you need to recharge the gadget immediately before training.

How do you know if the Mi Band 4 is fully charged?

To determine the charging rate of Xiaomi Mi Band 4 can be several ways:

1. Icon on the screen: when you connect to the charge, you get a lightning animation of the battery. As you charge, the filling level of the icon increases. 100% of the lightning disappears, and the battery is displayed fully painted over.
2. In-app notification: If the bracelet is synced to Mi Fit or Zepp, a full charge alert will appear in the mobile app (provided notifications are enabled).
3. Vibration: Some of the bracelet firmware will give you a short vibration signal when it reaches 100%, but this feature does not work on all versions of the software.

If the battery icon on the screen doesn’t update or shows an incorrect percentage, try:

• 🔄 Reset the bracelet (press the touch button for 10 seconds).
• 📱 Synchronize data with the Mi Fit application.
• 🔌 Disconnect and reconnect the charging cable.

⚠️ Warning: If the bracelet is running for less than 3-4 days after full charge (in standard use), this is a sign of a battery failure.

Typical charging errors and how to avoid them

Many Xiaomi Mi Band 4 users make mistakes that shorten battery life or bring the device down, among the most common ones:

• 🚫 Using unoriginal cables: Cheap analogues may not meet current requirements, leading to slow charging or overheating of contacts.
• 🚫 Charging at high humidity. If the bracelet is wet (for example, after showering), dry it for at least 30 minutes before charging.
• 🚫 Connecting to unstable power sources. avoid using USB-Ports in car charging or cheap power bank – they can give voltage surges.
• 🚫 Frequent charging up to 100%. Lithium polymer batteries (like in the Mi Band 4) are worse at carrying constant charging to maximum%.

Another common problem is contact oxidation, and if you notice a green coating on the metal parts of the connector, clean them with a cotton swab dipped in isopropyl alcohol, and don't use abrasive materials like sandpaper to avoid damaging the coating.

⚠️ Warning: If the bracelet doesn't charge after the contacts are cleaned, don't try to push the cable by force, which can bend the contacts inside the capsule, and then repair will be required.

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Optimal mode for battery life: Charge the Mi Band 4 when dropped to 20-30% and shut down 80-90%. This will extend battery life by 30-40%.

What to do if Xiaomi Mi Band 4 is not charging?

If the bracelet doesn't respond to the charging connection, don't panic. 90% of the time, the problem is solved without contacting the service.

1. Check the cable and adapter. Try charging the bracelet from another source (like a computer instead of an outlet) If you use a non-original cable, replace it.
2. Clear the contacts. As mentioned earlier, oxidation or pollution can block charging. Use alcohol and cotton swab.
3. Reset the bracelet. Press the touch button for 10 to 15 seconds until the screen goes out and turns on again. After rebooting, try plugging in the charger.
4. Check the capsule for physical damage, if there are cracks or dents on the case, the board may be damaged, in which case only repairs will help.
5. Update your firmware. Sometimes the charging failures are due to software errors. Connect the bracelet to the Mi Fit app and check for updates.

If none of the methods helped, try to reset the bracelet to the factory settings:

1. Go to Settings → Additional → Reset (on the bracelet screen).
2. Confirm the action.
3. After reset, reconnect the charger.

⚠️ Warning: Reset will delete all data from the bracelet (steps, pulse, settings) and sync it with the Mi Fit app beforehand.

If the bracelet is still not charging, contact an authorized Xiaomi service center.

• 🔋 Battery Failure (Replacement Required).
• 🔌 Damage to the power controller.
• 💻 Firmware failure (reflashing through service equipment will be required).

How to extend the battery life of Mi Band 4?

Xiaomi Mi Band 4 battery is designed for 300-500 full charge cycles, after which its capacity begins to decline noticeably.

• 🔄 Avoid deep discharge. Try to charge the bracelet when the charge drops to 10-20%. Full discharge (0%) negatively affects lithium polymer batteries.
• ☀️ Do not leave the bracelet in the sun or in the heat.High temperatures (above 40)°C) accelerate battery degradation.
• 📵 Turn off unnecessary functions. Constant sync with your phone, notifications and sleep monitoring consume charge. Configure them in the Mi Fit app.
• 🔋 Keep a 40-60% charge bracelet if you don’t plan to use it for a long time (e.g. while on vacation).

It is also worth calibrating the battery once every 2-3 months:

1. Discharge the bracelet before automatically shutting down.
2. Charge to 100% without interruption.
3. Repeat the cycle 2-3 times.

This will help the power controller to more accurately determine the level of charge.

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If you use the Mi Band 4 for training, turn off automatic pulse measurements in the background, which will reduce battery consumption by 15-20%.

FAQ: Frequent questions about charging Xiaomi Mi Band 4