How long is the Xiaomi Mi Band 4 charged: a full guide with tables and tips

The Xiaomi Mi Band 4 fitness bracelet remains one of the most popular activity-tracking gadgets, despite the release of new models. Its main advantages are affordable price, compactness and long work on a single charge. But even with a capacious 135 mAh battery, you sooner or later have to connect the device to charging. How long does it take to fully charge the Mi Band 4, and how to make this process as efficient as possible?

In this article, we will not only give you an accurate answer to the question of charging time, but also understand why it can differ from one user to another, learn how to properly charge the bracelet to extend the life of the battery, what mistakes owners often make, and what to do if the Mi Band 4 suddenly stopped charging, and also reveal a few myths about “fast charging” for fitness trackers.

How long does the Mi Band 4 take to charge?

According to the technical documentation from Xiaomi, the full charge of the Mi Band 4 battery takes about 2 hours when using the original charger. This time is indicated for a discharged battery (0%) to 100% at room temperature (+20... + 25 ° C).

• 🔋 Discharge level: If the bracelet is not fully discharged (for example, up to 30%), the charging time will be reduced to 40-60 minutes.
• 🔌 Power supply: charging from USB-The port of the computer (500 mA) will extend the process by 20-30% compared to the network adapter (1-2 A).
• 🌡️ Temperature: when charging in the cold (below) +10°C) or in the heat (above) +35°C) time may increase or decrease, but this is harmful to the battery.
• 📱 Firmware version: after software updates, some users note a change in charging time (usually within the limits of the software). ±10 minutes).

It is important to understand that the Mi Band 4 uses a lithium-polymer battery that is most efficiently charged in the range from 20% to 80%. Full cycle (0-100%) is not recommended to be carried out regularly, this reduces battery life.

Table: Charging time of Mi Band 4 depending on conditions

As you can see from the table, the time difference can be as much as 1.5 hours depending on the conditions, but more importantly, not the speed, but the correctness of the process - improper charging can shorten the life of the battery by 2-3 times.

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Use the original charging cable and adapter – this guarantees stable voltage and protection against overheating.

Next Next post: How to Charge Mi Band 4

It would seem that it could be easier to plug the bracelet into the charger and forget, but even here there are nuances that will help to avoid problems.

1. Take the bracelet capsule out of the silicone strap carefully, pull it toward the screen. Don't put too much effort into it, because the bracelets are plastic and can break.
2. Connect to the charger. Match the contacts on the back of the capsule with the contacts on the charger. You should hear a slight click, which means that the bracelet is locked.
3. Choose a power source. Optimally use the original Xiaomi adapter (5V/1A). If you don't have one, you'll find a smartphone adapter with similar parameters.
4. Check the indication. The charge icon will appear on the bracelet screen (lightning inside the battery). If there is no indication, check the density of the contacts.
5. Wait 100%. Don't interrupt charging if the bracelet is not fully charged, which can cause the battery level to be misrepresented.
6. Turn off the power. Once you reach 100%, immediately disconnect the bracelet, and being charged for a long time under full load will damage the battery.

Check the cleanliness of contacts on the bracelet and charging|Use the original cable or certified analogue|Make sure the temperature in the room +15...+25°C|Do not leave the bracelet on charging for more than 3 hours-->

If after connecting to charging the bracelet does not respond:

• 🔌 Check the cable and adapter (try charging another device).
• 🧹 Clean the contacts on the bracelet and charger with a cotton swab soaked in alcohol.
• 🔄 Reset the bracelet: Press the touch button for 10-15 seconds before the Mi logo appears.

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If the bracelet does not charge for a long time, try connecting it to another one. USB-Sometimes the problem is that the power supply is not enough.

Frequent Mi Band 4 charging errors and their consequences

Many users are unaware that their actions reduce the life of the battery Mi Band 4.

⚠️ Note: Use of non-original chargers with higher voltage 5V This can cause the battery to bloat or the power controller to fail.

• 🔥 Charging at extreme temperatures (<0°C) or in the heat (>+40°C) lithium polymer batteries degrade in 3–5 It's faster than that: +10...+30°C.
• ⚡ Use of fast chargers. Power adapters. >2A (For example, laptops can overheat the bracelet controller — 5V/2A, It's better not to go over 1A.
• 🕒 If you leave the bracelet connected overnight, the battery will be microcharged to maintain 100%, which reduces its lifespan.
• 🔌 Frequent charging up to 100%. Lithium polymer batteries don't like full cycles. Optimal to keep the charge in the range of 20 to 80%.
• 💦 Moisture on contacts despite water protection (5) ATM), charging a wet bracelet can cause corrosion of contacts.

One of the most insidious mistakes is using wireless charging, and some users try to charge the Mi Band 4 via Qi stations by wrapping the bracelet with wire or foil, which is not only inefficient (charging time will increase to 6-8 hours), but also dangerous: overheating or short circuiting is possible.

How to speed up charging Mi Band 4: working ways

If you need to charge the bracelet urgently, you can reduce the time by 20 to 30 percent without harming the battery.

• ⚡ Use the adapter with current. 2A. The original adapter from Xiaomi for smartphones (for example, from Redmi Note 8) will speed up charging by 15-20 minutes compared to the standard one. 1A.
• 📵 Disable Bluetooth. Disconnect the bracelet from your smartphone during charging using the Mi Fit app. This will reduce the load on the processor and speed up the process.
• 🌡️ Charge in a warm room. If the bracelet is cold (for example, after the street in winter), hold it for 10-15 minutes in the room before charging.
• 🔋 Charge to 80 percent. The last 20 percent accumulates the longest. If you don't have enough time, charge to 80 percent, that's enough for 3 to 5 days of operation.

And now, what doesn’t work despite the advice on the internet:

• ❌ "Overclocking with firmware. Some users are trying to modify the bracelet software to speed up charging, and not only does it fail, it can also disable the device.
• ❌ High-current powerbank charging. Mobile batteries often give off unstable voltage, which is harmful to a small bracelet battery.
• ❌ The Mi Band 4 doesn't have fast charging, and all of these settings are a myth.

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The safest way to speed up charging is to use a 2A adapter and turn off sync with your phone. Other methods are either ineffective or dangerous.

How much does the Mi Band 4 charge after it is fully charged?

Battery life Xiaomi Mi Band 4 depends on the intensity of use and settings, according to the manufacturer, with standard settings bracelet works:

• 📊 Up to 20 days standby (without active use).
• 🏃 Up to 14 days with moderate use (stepmeter, notifications, 1-2 workouts per day).
• ⚡ Up to 7-10 days with intensive use (constant monitoring of heart rate, GPS-Tracking, frequent notifications).

In practice, users note the following indicators (according to surveys on forums):

To extend the working time between charges:

1. Disable unused notifications (e.g. from social media).
2. Reduce the pulse rate to 1 time every 30 minutes (in the Mi Fit settings).
3. Use dark dials — AMOLED-Mi Band 4 screen uses less energy to display them.
4. Turn off the automatic brightness and set it to 50-70%.

⚠️ Warning: If the bracelet discharges in 1-2 days without active use, this is a sign of a battery malfunction or software failure. Try resetting via Mi Fit (section "More" → Reset. If the problem persists, contact the service.

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

It's not that uncommon for a bracelet to fail to respond to charging, and it can be software-based or hardware-based, and we'll figure out how to diagnose and fix the problem.

• 🔌 Check the charger. Connect another device (like a smartphone) to the same adapter and cable. Try charging the bracelet from another source (computer, powerbank).
• 🧹 Clean the contacts. Use a cotton swab dipped in isopropyl alcohol. Don't use metal objects, they can damage the contact coating.
• 🔄 Reset the settings. Press the touch button for 15-20 seconds before rebooting. If it doesn't work, reset it through Mi Fit (Device Profile section). → Reset").
• 🔋 Check the battery. If the bracelet turns on but turns off, it's probably a bloated battery. Signs: the case is thicker, the screen is bulging, the bracelet is not flat on the table.

If none of these methods worked, the problem may be:

• 💥 Power Controller – Requires a replacement fee (repair cost) ~1500–2,000 rubles.).
• 🔌 Damaged charging connector – often occurs when a sloppy connection is made.
• 🔋 Worn-out battery – after 300-500 charging cycles, the capacity drops by 50-70%.

At home, you can try to repair contacts:

1. Carefully disassemble the body of the bracelet (you need a plastic spatula).
2. Check the integrity of the plume connecting the battery to the board.
3. If the contacts are oxidized, clean them with a swallow or alcohol.
4. Collect the bracelet and check the charging.

⚠️ Warning: Disassembly of the bracelet is warranty-free. If the device is warranty, contact the Xiaomi service center. Self-repair is only justified for devices older than 1-2 years.

FAQ: answers to frequent questions about charging Mi Band 4