How to know that the fitness bracelet Xiaomi Mi Band 3 is charging

Ownership of wearable electronics from Xiaomi often confronts users with a situation where the activity tracker ceases to respond to presses and the screen remains black. Owners of the Mi Band 3 model released several years ago, especially often wonder how to understand that the fitness bracelet is charging, since the visual indication here has its nuances. The absence of a clear LED indicator on the body of the module makes you rely solely on the reaction of the display, which can confuse an inexperienced user.

The first thing to do when you detect a discharged gadget is to connect it to the power source using the original cable. It is important to understand that if the device is completely gone into deep discharge, you should not expect an instant reaction from the screen. The battery power management system in these models takes time to accumulate a minimum charge before it can activate the display controller.

In most cases, the charging process starts automatically, but sometimes it takes a few minutes of waiting or even a slight tap on the screen to activate it. If you are in doubt whether energy is coming to the device, you should pay attention to the behavior of the icon of the battery that will appear on the display after waking up. Below we will discuss in detail all the steps of the interaction of the charger and tracker.

⚠️ Note: If, after connecting to USB-The port computer does not emit a characteristic connection sound of the new device, and the screen of the bracelet remains completely black for more than 15 minutes, most likely, the contacts on the module itself or the charging cable are oxidized.

Visual indication on the display screen

The main way to determine the charging status in Xiaomi Mi Band 3 is visual control. OLED-Unlike the cheaper ones, there are no flashing LEDs on the back, so all communication with the user is through the GUI. USB-port of the computer or adapter, animation should appear on the screen.

The first image you'll see is a large pictogram of the battery. If the battery has been discharged to zero, this icon can be crossed out or display a minimum level of filling. A red lightning or battery icon signaling a critically low charge level, which is normal for a device that has been lying around for a long time without use.

As the lithium polymer battery accumulates, the image on the screen changes, the red color changes to green, and the crossed-out battery turns into a filling scale. It is important to note that the Mi Band 3 screen goes out a few seconds after charging to save energy, so to see the status again, you need to touch the touch area.

If the screen displays an icon of a socket with a crossed-out circle or the inscription "Low Battery" appears immediately after the connection, this means that the current is coming, but it is not enough to turn on the basic functions, in which case you need to leave the device alone for 10-20 minutes.

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If the screen lights up and goes out cyclically (flashes), it is a sign of unstable contact. Try to remove the module from the strap and wipe the contacts on the back with an alcohol wipe.

Device behaviour in a deep discharge state

The situation when the fitness bracelet has not been used for a long time is the most common cause of panic users. Lithium polymer batteries installed in the Mi Band 3 have the property of self-discharging, and if the voltage falls below a certain threshold, the protection controller blocks charging to avoid bloating or ignition.

In this state, the device can behave paradoxically: when connected to charging, the screen may not light up at all in the first 5-10 minutes. Many people mistakenly believe that the tracker is faulty and stop trying to charge it.

To know that the process has started, you need to periodically (every 2-3 minutes) press the touch button. First, the screen will react with a large delay or not at all. Then you can only appear the MI logo and immediately go out. This is a good sign, which means that the voltage is already enough to start the processor, but not enough to work the display at full strength.

• 🔋 In a deep discharge, the screen may not light up the first 10-15 minute.
• ⏱️ Full recovery of the tank to working condition can take up to 2 hours.
• 🔄 Periodic pressing of the button helps to wake up the display controller.
• 🌡️ The device can heat up slightly in the contact area in the first minutes of charging.

There is also a possibility that the device went into protective mode permanently if the discharge lasted for months, in which case the “rock-up” method helps: a short-term connection and disconnection of the cable every 10 seconds for a minute, after which the device is left on charge for a long time.

Working with the original charging cable

The success of charging Xiaomi Mi Band 3 is 90% dependent on the quality of contact between the module and the charger. the design of this tracker involves removing the capsule from the silicone strap. The cable is a plastic base with two metal contacts that should fit tightly to the response pads on the back of the bracelet.

The original cable has a specific cutout shape that locks the module. If you use a third-party accessory or cable from another model (for example, from Mi Band 2 or Mi Band 4, which have different pin locations), charging may not go, or worse, the contacts may close.

Often, users experience contact oxidation, because the bracelet is worn on the hand, it is constantly exposed to sweat, moisture and cosmetics, and the surface of metal plates forms an oxide film that prevents current from passing, which visually can look like a light whitish or dark coating.

To ensure a reliable connection, it is necessary:

• 🧼 Regularly wipe the contacts with a dry soft cloth before each charge.
• 💧 Avoid getting water on the contacts at the time of connection of the cable.
• 🔌 Use only the correct ones USB-port.
• 🚫 Do not use cables with damaged insulation or bent contacts.

⚠️ Never try to charge Mi Band 3 by inserting contacts into your device. USB-The port is directly without a plastic base holder, and this is guaranteed to short circuit and fail the device.

Indication through the Mi Fit application

The most reliable source of information about the battery status is the bracelet bundle with the smartphone. If the tracker screen is out, but you want to make sure that charging is going on, you can use the Mi Fit app (or Zepp Life), which requires that the smartphone has Bluetooth on and the application has permission to work in the background.

When connecting the cable to USB-In the port, even if the bracelet screen is turned off, the wireless controller can activate and send a power connection signal to the phone. In the application interface, you will see a pop-up notification or change the status of the device.

If you go into the profile of the device in the app, you'll see the exact percentage of charge in real time, and that's the only way to see the charging dynamics when the bracelet screen itself has gone out to save energy, and if the percentage of charge is rising, then all systems are working normally.

The table below shows the main states of the indicators and their decoding:

Typical problems and methods of their solution

Even with all the instructions, there can be situations when the fitness bracelet refuses to charge. One common reason is the use of powerful power supplies from modern smartphones with support for fast charging (Quick Charge, Power Delivery). The controller of the old tracker may incorrectly negotiate the charging protocol, which simply does not supply current.

In this case, it is recommended to use a less powerful source, for example, USB-port of computer, laptop or old power supply on 1A (5V 1A). Problems can also be caused by a software failure when the system “hangs” in standby mode.

To eliminate software errors, there is a forced reboot procedure that often helps start the charging process: you need to put the bracelet on charge, wait for the logo to appear (if it appears), or just leave it on the contacts, and press the touch button 5-7 times in a row for 10 seconds.

• 🔄 Try another one. USB-cable or port, preferably USB 2.0.
• 📱 Reboot your smartphone and reconnect Bluetooth.
• 🧹 Carefully clean the contacts of the module and charging base.
• ⏳ Leave the device on charge on 2-3 half-hour.

If nothing helps, it is possible that the battery life is exhausted. Lithium polymer batteries have a limited life cycle, and after 2-3 years of active use, their capacity may fall so much that they will no longer hold charge.

Charging time and autonomy Xiaomi Mi Band 3

Understanding how long it takes to recover energy will help you distinguish normal from faulty.The Mi Band 3 is equipped with a 110 mAh battery. With a standard charger (current around 150-200 mA), a full charge cycle takes from 1 to 1.5 hours.

It's important not to overload the device after reaching 100%. Although modern controllers are able to cut off current, prolonged exposure to voltage can contribute to the degradation of battery chemistry. Once you see a full green battery and vibration on the screen (if it's on), the device can be removed.

A fully charged tracker can be 10 to 20 days autonomous depending on the settings. If your bracelet discharges in 1-2 days, this is a clear sign of battery wear or a software error requiring a reset.

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The optimal time to fully charge the Mi Band 3 is 60-90 minutes. Keep the device on charge for longer than 2-3 hours unnecessarily is not recommended.