Why Charging Is Important for the Mi Band 4
The Xiaomi Mi Band 4 fitness bracelet remains one of the most popular wearables due to its combination of functionality and affordable price. However, even a simple action like charging can raise questions — especially for new users. Mishandling a charger or connector often leads to rapid battery wear, damage to contacts, or even breakage of the bracelet.
In this article, we will discuss not only the basic charging procedure, but also the nuances that the manufacturer does not say: how to choose the original charger, how long it takes to complete the cycle, what to do if the bracelet does not charge, and how to extend the life of the battery.
Completement and original charger
In the box with Xiaomi Mi Band 4 comes a special charger - magnetic dock connector with USB-connector type A. It is not a universal cable: it has a unique shape and polarity, so replacing with third-party analogues can damage the bracelet. The original charger has the following features:
- 🔌 Magnetic fastening - fixes the bracelet in the correct position, eliminating the skewed contacts.
- 🔋 Charging current 5V/0.5A — Exceeding these values accelerates the degradation of the battery.
- 🛡️ Short-circuit protection – built-in controller prevents overheating.
If the original charger is lost, only buy certified Mi Band 4-labeled counterparts. Cheap fakes often fail to meet safety standards and can disable the bracelet power controller.
⚠️ Note: Mi Band 3 or Mi Band 5 chargers are not recommended. Despite the similarity, the connectors have different stitches, which can cause firmware failure.
Next Next post: How to Charge Mi Band 4
The charging process takes minimal effort, but requires care. Follow this instruction to avoid errors:
- Remove the capsule from the strap. Press the button on the back of the bracelet and pull the capsule upwards. Don't use excessive force, the fixing mechanism is fragile.
- Connect the charger. Join the capsule contacts to the magnetic dock connector. Right position is when the charging indicator (white LED) starts flashing.
- Connect to the power source. Use it. USB-port of the computer, adapter with output 5V/1A Avoid quick chargers (Quick Charge) as they shorten battery life.
- Wait for the full charge. The light will stop flashing and will burn with even light. On average, the process takes 1.5-2 hours with the battery running low.
Once the charge is complete, disconnect the capsule from the docking station and place it back in the strap. Do not leave the bracelet on charging for longer than 3 hours - this can lead to overheating.
☑️ Checklist before charging
How long does the Mi Band 4 charge?
Charging time depends on several factors: the level of discharge, the quality of the charger and the power source. Below is a table with indicative values:
| Charge level when connected | Time up to 100% (original ROM) | Time up to 100% (non-original ROM) |
|---|---|---|
| 0–10% | 1 hour 40 minutes - 2 hours | 2 hours 30 minutes - 3 hours |
| 20–30% | 1 hour 10 minutes - 1 hour 30 minutes | 1 hour 40 minutes - 2 hours |
| 50–70% | 40-50 minutes | 1 hour - 1 hour 20 minutes |
| 80–90% | 20-30 minutes | 30-40 minutes |
If the bracelet is charged for more than 3 hours using the original charger, this indicates a malfunction of the battery or power controller, in which case it is recommended to contact the service center.
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To speed up charging, turn off sync with the Mi Fit app while you connect to power. Background processes can increase charging time by 10-15%.
Common Mistakes and How to Avoid Them
Many users inadvertently shorten the life of the Mi Band 4 due to improper charging actions.
- 🔥 Charging under direct sunlight or near heat sources (e.g. on a laptop) degrades the lithium polymer battery.
- 💧 Moisture on contacts, even if the bracelet is protected IP68, charging of a wet device can cause corrosion of contacts.
- ⚡ Use fast chargers. Access adapters. 9V/2A or 12V damage the power controller.
- 🔌 Frequent charging up to 100%; optimal lithium polymer battery level 30-80%; full discharge and maximum charge accelerate wear and tear.
Another common problem is loose contact fit, and if the charging indicator is flashing intermittently or not at all, check:
- Cleanliness of contacts (wipe with an alcohol napkin).
- Integrity of the magnetic connector (whether there are cracks or deformations).
- Correct connection (bracelet should "magnetize" with a slight click).
⚠️ Warning: If the bracelet is still not charging after the contacts are cleared, do not try to move the cable or press the connector. This may damage the board.
How to extend the battery life
The Mi Band 4 battery is designed for 300-500 full charge cycles, after which the capacity begins to decline. To delay the replacement of the battery, follow these recommendations:
- 🔄 Avoid full discharge. Connect the bracelet to charge at 20 to 30 percent. Deep discharge (below 5 percent) causes irreparable damage to the battery.
- 🌡️ Watch the temperature. Optimal range for charging is 10-35.°C. Charging in the cold or heat reduces battery life.
- 📵 Turn off unnecessary functions. Constant sync with Mi Fit, notifications and screen highlighting consume charge.
- 🔋 Keep it 50 percent charged. If you don't use it for a long time, leave it with half charge in a cool place.
The average battery life when properly operated is 2-3 years. If the bracelet began to discharge in a few hours, this is a sign of wear and tear of the battery - it can be replaced in the service center (the cost of the service is ~ 1500-2000 rubles).
What to do if the bracelet is discharged in a day?
Frequent questions and problem-solving
Even with all the rules, users face difficulties. Let's consider the most common questions:
The bracelet is not charging, the indicator is not burning.
Can I charge Mi Band 4 from Power Bank?
How much does the Mi Band 4 charge hold?
Can I charge the bracelet without removing it from the strap?
What if the bracelet stopped turning on after charging?
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Regular battery calibration (full discharge + charge up to 100% every 2-3 months) helps to maintain the accuracy of the charge indicator.