How to properly charge the fitness bracelet Xiaomi Mi Band 4: full instructions with tips and warnings

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 compactness, long battery life and affordable price. However, even such a simple device requires proper handling, especially when it comes to charging, and failure to follow basic guidelines can lead to rapid battery wear, malfunctions or even breakdown.

In this article, we’ll take a look at all the nuances of charging the Mi Band 4, from the choice of the original cable to the intricacies of operation that will extend the life of your bracelet, how to avoid typical errors, and what to do if the device does not respond to the connection to the network, and for those who are experiencing problems, we have prepared a section on troubleshooting with step-by-step solutions.

Complete and original charger for Mi Band 4

In the box with Xiaomi Mi Band 4, the manufacturer puts a special charging cable with a magnetic connector. USB-This is a unique accessory designed for this particular model:

• 🔌 USB-Type A – inserted into a power adapter, computer or power bank;
• 🧲 Magnetic connector - attached to the back of the bracelet.

Important: the magnetic connector is polar. If the bracelet doesn't start charging, flip the cable over the other side. The original Xiaomi cable is marked with the brand logo and has a clear fixation - it should not hang around or detach when you move your hand lightly.

Many users lose their native cable or buy a used cable without it, in which case you can buy a third-party analogue, but there are risks:

• ⚡ Incorrect voltage can damage the battery;
• 🔥 Cheap cables often overheat;
• 🚫 There is no guarantee of compatibility with the bracelet firmware.

💡

If you lost the original cable, look for a replacement labeled "Mi Band 4" and stable work reviews. Avoid universal "all Mi Band" - they may not be suitable.

Step-by-step: how to charge Xiaomi Mi Band 4 correctly

The charging process is simple, but there are a few key things that affect speed and safety.

1. Take the bracelet capsule out of the silicone strap carefully, pull it aside, which will make it easier to access contacts and prevent overheating.
2. Connect the magnetic cable. Put the connector on the back of the capsule, it should magnetize with a slight click. Make sure the contacts match (the cable and the bracelet have tags).
3. Connect. USB-Put the cable in the power adapter (5V/1A) or USB-Do not use Quick Charge, Power Delivery – they can reduce battery life.
4. Wait for the indication. The charge icon will appear on the bracelet screen (lightning inside the battery). If there is no indication, check the connection or try another one. USB-port.

Take the capsule out of the strap.|

Checked the cleanliness of the contacts on the bracelet and cable |

Use an original or certified cable|

Connected to a power source with a voltage of 5V/1A-->

The full charging time of the Mi Band 4 is 1.5-2 hours (0% to 100%). However, after 30-40 minutes, the bracelet will gain enough energy for a day of operation. During charging, you can use basic functions (watching time, steps), but it is not recommended to start energy-intensive tasks (for example, measuring the pulse in continuous mode).

How much does the Mi Band 4 charge hold and how to extend autonomy

The official specs of Xiaomi Mi Band 4 promise up to 20 days of operation on a single charge, however, the real life depends on the intensity of use:

To extend the life of the battery, follow these recommendations:

• 🔋 Avoid full discharge (charge at 10-20% charge);
• ☀️ Do not leave the bracelet on charging for more than 3 hours - this leads to overheating;
• 🌡️ Store and charge the device at a temperature of 10-35°C;
• 📵 Turn off Bluetooth on your bracelet if you are not syncing.

Once in 2-3 weeks |

Once every 10 days |

Every week |

Less than once a month-->

A critical mistake many users make is to keep the bracelet discharged at 0% for a long time (for example, if you don’t wear it in winter), which leads to a deep discharge of the battery and can make it unusable for further use. If you plan to not use the Mi Band 4 for more than a month, charge it up to 50% and store it in a dry place.

Typical Charging Problems and Their Solutions

Even when properly operated, there can be failures, and let's look at the most common faults and how to fix them:

1. Bracelet is not charged (no indication)

Causes and solutions:

• 🔌 Dirty contacts - wipe them with a cotton swab soaked in alcohol;
• 🧲 Bad fit of cable - check the magnetic mount, try to flip the connector;
• 💻 Faulty. USB-Port – Try another adapter or computer;
• 🔋 Firmware failure – reset the bracelet to factory settings via the Mi Fit app.

2.The bracelet discharges quickly

Possible causes:

• 📱 Too Frequent Phone Sync – Reduce the Spare in Mi Fit Settings;
• 🩺 Continuous monitoring of the pulse – turn it off in bracelet settings;
• 🌡️ Extreme temperatures – do not wear the bracelet in the sauna or in the cold;
• 🔄 Outdated firmware - update the software through the application.

If none of these methods worked, the problem could be battery wear. The average battery life in the Mi Band 4 is 2-3 years when used actively, after which the capacity drops by 30-50%, and the bracelet requires a battery replacement (which is often not economically feasible).

Can I charge the Mi Band 4 from a power bank, laptop or phone charger?

Yes, but with reservations, the bracelet is compatible with any power source that provides 5V/1A (standard USB).

• 🔌 Power Bank – suitable if its output voltage does not exceed 5V. Avoid models with fast charging function;
• 💻 Laptop/computer – safe, but charging may be slower due to current limitations USB-port;
• 📱 Charging for a smartphone - only if it gives exactly 5V/1A. Charges with Quick Charge support or VOOC not fit!

💡

Use of non-certified chargers with higher voltage 5V It can cause the battery to bloat or the power controller to fail. If you don't have the original adapter, choose a certified adapter. USB-charger 5V=1A.

Lifehack: If you travel often, buy a compact USB-This allows you to charge the bracelet and phone simultaneously from the same adapter, without risking overloading the port.

How to Care for the Mi Band 4 Battery to Last Longer

The lithium polymer battery in the Mi Band 4 has a limited charging cycle life (about 300-500 full cycles).

1. Avoid extreme temperatures. Do not leave the bracelet in the sun, in direct beams or near heating appliances. The optimal range is 10-35°C.
2. Keep the bracelet charged at 10-20% charge, and a full discharge of up to 0% reduces battery life.
3. Don't keep it 100% charged. If you don't use the bracelet for a long time, charge it to 50% and turn it off.
4. Use only certified cables, and cheap ones can produce unstable voltages, leading to battery degradation.

Fun fact: the Mi Band 4 uses a 135mAh battery. In comparison, the Mi Band 5 and 6 have increased capacity to 125mAh and 145mAh respectively, but with software optimization, autonomy has increased marginally, which means that proper operation is more important than small differences in capacity.

💡

If you notice that the bracelet began to discharge in 2-3 days instead of the usual 2 weeks, check the background processes in the Mi Fit application. Sometimes synchronization failures or incorrect notification settings lead to increased power consumption.

Frequent questions about charging Xiaomi Mi Band 4

If your question is not covered in the article, check the official documentation of Xiaomi or contact for support through the Mi Fit app. Remember: proper charging is the key to the long-term operation of your fitness bracelet!