How much time is charged watch Xiaomi Mi Band 4: a full guide with tables and tips

Xiaomi Mi Band 4 Charging Time: What You Need to Know Before Starting

The Xiaomi Mi Band 4 fitness bracelet remains one of the most popular wearables even years after its release, with its main advantages being compact, functional and long battery life. But when the battery finally dies, users are faced with the question: how long does it take to fully charge?

Official data from Xiaomi indicates 1.5-2 hours to charge from 0% to 100%, but in practice this time can vary from 45 minutes to 3 hours, depending on the conditions. In this article, we will analyze all the factors that affect charging speed, typical user errors and ways to extend the battery life.

If you're charging the Mi Band 4 for the first time, or if you notice that it's taking longer than before, this guide will help you understand the reasons and fix the situation. Let's start with the basic data.

How long is the Mi Band 4 charged?

According to the technical documentation of Xiaomi, the bracelet Mi Band 4 is equipped with a lithium-polymer battery with a capacity of 135 mAh. The manufacturer declares the following charging parameters:

• 🔋 Full charge (0–100%): ~2 One hour with the original cable and adapter 5V/1A.
• ⚡ Fast charging to 80%: ~1 hour.
• 📉 Discharge during active use: up to 20 days (in standby mode - up to 30 days).

But these numbers are the perfect scenario, and they only work when all the conditions are met: the original charger, room temperature, no background processes.

It’s important to understand that the Mi Band 4 doesn’t support Quick Charge technology, so using powerful adapters (like smartphones) won’t speed up the process, and may even hurt.

What the charging speed depends on: 5 key factors

If your bracelet is charging longer than the 2 hours stated, the reasons may lie in one or more factors, and let's take them in order, from the most obvious to the hidden.

Type of charger and cable

The original Mi Band 4 cable has a unique magnetic contact connector, and the use of non-original accessories is fraught with:

• 🔌 Bad contact: bracelet is charged, then not.
• 🔥 Overheating: Cheap cables may not meet safety standards.
• ⚡ Low current: charging is 2-3 times slower.

🔹 How do you check? Check the contacts on the cable and the bracelet -- they should be clean, without oxidation. If the cable isn't original, try replacing it.

2. Power supply

The power of the adapter has a direct effect on speed.

• 🔌 5V/1A (standard charger from Xiaomi smartphones).
• ⚠️ 5V/2A: It can be used to reduce battery life.
• ❌ USB-PC/laptop port: usually gives everything 0.5A — charging will take 3+ hour.

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If you use power bank, choose models with output 5V/1A or 5V/2A. Cheap power banks can give unstable voltage, which is harmful to the battery bracelet.

3. Ambient temperature

Lithium polymer batteries are temperature sensitive. Optimal range for charging: 10-35°C. Deviations:

• ❄️ 10 below°C: Chemical processes slow down, charging time increases.
• 🔥 Above 35.°C: risk of battery degradation, possible charging stop.

⚠️ Warning: If the bracelet warms up while charging (especially in the contact area), immediately disconnect it and let it cool.

Battery condition

As time goes on, battery capacity decreases, and if your Mi Band 4 is in use for more than a year, the following problems may occur:

• 📉 Reduced capacity: bracelet discharges faster and charges more slowly.
• 🔄 "Memory effect: if you constantly charge from 20% to 80%, the battery forgets the full cycle.
• ⚡ Bloating: Physical damage to the battery (requires replacement).

🔹 How do you check? Use Mi Fit or Zepp (Battery status) if the capacity has dropped below 80 percent of its original capacity, it's time to consider replacing it.

Background processes

If during charging the bracelet:

• 📱 Synchronized with the smartphone (update firmware, data transfer).
• 🔔 Receives notifications (calls, messages).
• 🏃 Pedometer or pulsemeter active.

... some of the energy is used for these tasks, not for charging.

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Ideal conditions for fast charging: original cable + adapter 5V/1A + temperature 20–25°C + switched-off.

Next Next post: How to Charge Mi Band 4

It's kind of hard to plug in and wait, but even in a process that's so simple, there are nuances that can help you avoid problems.

1. Take the bracelet capsule out of the silicone strap carefully, pulling it towards the screen.
2. Clean the contacts. Wipe the metal contacts on the bracelet and cable with a dry wipe (you can moisten slightly with alcohol).
3. Connect the cable. You combine the magnetic connectors, you'll hear a click.
4. Choose a power source. Use an adapter. 5V/1A (Xiaomi Redmi is a good fit).
5. Start charging. The battery light will show up on the bracelet screen with the lightning animation.

Clean contacts of dust and moisture|

Use the original cable |

Disable synchronization in Mi Fit|

Place the bracelet in a ventilated place|

Do not cover the bracelet while charging-->

⚠️ Note: if the charging indicator does not appear after connecting the cable, check:

• 🔌 Density of the contacts (try to press the cable slightly).
• 🔋 Battery status (possibly completely discharged and wait 5-10 minutes).
• 📱 Possibility of work USB-port or adapter (try another device).

If the bracelet does not respond to charging at all, there may be a firmware failure, in which case, resetting to factory settings (press the touch button for 10 seconds) or flashing through Mi Fit will help.

Frequent problems and their solutions

Even with all the rules, Mi Band 4 users sometimes have problems, and let's look at the most common cases and how to fix them.

1.The bracelet is charging too long (3).+ hour)

Possible causes and solutions:

• 🔌 Unoriginal cable → Buy an original or proven counterpart (e.g. from Mi Band 5).
• ⚡ Weak power source → Connect to the adapter 5V/1A instead USB-port.
• 📉 Worn-out battery → Check the capacity in Mi Fit or replace the battery.
• 🧊 Low temperature → Move the bracelet to a warm place for 30 minutes before charging.

2. Charging stops at 99%

This is one of the most common problems.

• 🔄 Failure of battery calibration → Fully discharge the bracelet (before switching off), then charge to 100% without interruptions.
• 📱 Conflict with the annex → Reinstall Mi Fit or Zepp, then sync the bracelet.
• 🔋 Problem with the power controller → Renovation required (replacement of fees).

3.The bracelet shall not be switched on after charging

If, after connecting to the charger, the screen remains black:

• 🔋 Deep discharge. → Wait 15-30 minutes, sometimes it takes time to wake up the controller.
• 🔌 Bad contact. → Check the cleanliness of the contacts and the density of the cable.
• 💥 Hardware failure → Try resetting (click the button for 10 seconds).

⚠️ Warning: If the bracelet does not show signs of life after an hour on charging, do not try to "resuscitate" it homemade ways (heating, connecting to other power sources.

4.The bracelet warms up while charging

Light heat is normal, but if the body becomes hot (over 40)°C):

• ❌ Shut off power immediately.
• 🔌 Check the cable and adapter for damage.
• 📱 Update the firmware with Mi Fit (possibly a software bug).
• 🔋 If the heating is repeated – contact the service (possibly a faulty battery).

How to extend the life of the battery Mi Band 4: 7 expert tips

The average battery life of the Mi Band 4 is 2-3 years when used actively, but if you follow these recommendations, you can extend it by another 1-2 years:

1. Avoid full discharge. The optimal range is 20-80%. Regular discharges to 0% reduce battery life.
2. Don't charge "all night." Once you reach 100%, turn off the power bracelet to avoid recharging.
3. Use original accessories. Cheap cables and adapters can damage the power controller.
4. Update your firmware. Newer versions often optimize your power consumption (check the updates in Mi Fit).
5. Turn off unnecessary functions, like a permanent pulse monitor or social media notifications, which puts the battery down.
6. Keep it cool. Do not leave it in direct sunlight or near heat sources.
7. Calibrate the battery every 3 months. A full discharge-charging cycle helps to reset the controller errors.

🔹 Bonus tip: if you don't use the bracelet for a long time, charge it up to 50% and store it in a dry place.

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The most harmful scenario for the battery is to keep the bracelet on charge for a day at 100%, which leads to overheating and accelerated degradation of lithium polymer cells.

Xiaomi’s other models: Who is charging faster?

If you’re thinking about buying a new bracelet, it’s helpful to compare the Mi Band 4 to other models in terms of charging time and autonomy.

As you can see from the table, the Mi Band 4 is not the leader in charging speed, but offers better autonomy among its peers. If you are critical to recharging speed, look at the Mi Band 5 or Smart Band 7 – they charge 30-50% faster.

However, newer models often lose out on the Mi Band 4 in reliability, and many users note that the bracelets of the latest generation are more likely to suffer from battery and firmware problems.

FAQ: Answers to Frequent Questions