Xiaomi Mi Band 2: Charging Time: What Affects Speed and How to Avoid Typical Problems
The Xiaomi Mi Band 2 fitness bracelet, released in 2016, is still popular with users due to its reliability and functionality. However, as the device ages, many people are faced with the question: how long it takes to fully charge the battery and why this process sometimes stretches for hours? The answer depends on several key factors - from the state of the battery to the type of charger.
In this article, we will look at the regulatory time frame for charging the Mi Band 2, compare original and non-original charging, and provide practical tips on how to speed up the process and avoid typical errors, focusing on the critical moments when the bracelet may not charge at all – and what to do about it.
If your bracelet is running too fast or charging is taking an abnormally long time, here you will find a checklist to diagnose the problem and how to solve it – from simple cleaning contacts to replacing the battery.
How long should the Mi Band 2 be charged?
According to the manufacturer’s specifications, Xiaomi Mi Band 2 is equipped with a lithium-polymer battery with a capacity of 70 mAh. Under ideal conditions (original charger, room temperature, new battery), the full charge time is:
- 🔋 From 0% to 100%: 1.5–2 hours.
- ⚡ Up to 80%: ~1 hour (fastest stage).
- 🔄 The last 20%: can take up to 40-50 minutes due to slowing current.
But these numbers are relevant for the new device, and over time, the battery capacity decreases, and charging can take up to 3-4 hours, and speed is also affected by:
- 🔌 Charger type: Original adapter vs. non-original (more in the next section).
- 🌡️ Ambient temperature: at +5°C and below charging slows down by 30-50%.
- 📱 Contact state: Oxidation or pollution increases resistance.
Original vs. Non-Original Charging: Comparison of Speed and Risks
One of the main reasons for delayed charging is the use of non-original chargers. Let's compare their characteristics:
| Parameter | Original charging | Non-original (quality) | Unoriginal (cheap) |
|---|---|---|---|
| Charging time 0-100% | 1.5-hours--2 hours | 2.5 hours | 3-5 hours (or not charged) |
| Charging current | ~50–60 mA (stable) | 40–50 mA (may fluctuate) | <30 mA (risk of overheating) |
| Risk of battery damage | Minimum | Medium (with prolonged use) | High (overheating, bloating) |
| Compatibility with contacts | Perfect (exact landing) | May require bending contacts | Often poor contact |
⚠️ Attention: Cheap non-original charges often have incorrect polarity of contacts, which can lead to short circuit and failure of the bracelet. If after charging the bracelet is heated or not determined by the application, immediately turn it off!
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Before buying a non-original charge, check the reviews of a particular model. A good sign is the presence of magnets for fixation, as in the original.
Step-by-step: how to charge Mi Band 2 for maximum service life
Even with the original charge, you can make mistakes that shorten battery life.
Connect the charger to USB-port 500 M.A. (computer or adapter) 5V/1A)
Make sure the bracelet contacts and charging are clean (wipe with alcohol if necessary)
Place the bracelet in the charger so that the indicator lights up red (means that there is a charge)
Do not interrupt the process until you reach 100% (frequent incomplete charging damages the battery)
Disable the bracelet from charging immediately after completion (recharging harms lithium polymer batteries)-->
🔍 How to know if the bracelet is charging?
- 🔴 Red indicator: charging is underway.
- 🟢 Green indicator: Charging completed (100%).
- ⚫ Indicator not burning: no contact or malfunction.
⚠️ Warning: If the bracelet is not charging despite the clean contacts and original charging, try connecting the charging to another one USB-port (for example, from charging your phone instead of a computer) Sometimes the problem lies in the insufficient port current.
Typical Problems and Solutions: Why Mi Band 2 Doesn't Charge or Takes Too Long to Charge
If your bracelet is not behaving properly when charging, use this diagnostic table:
| Problem. | Possible cause | Decision |
|---|---|---|
| The bracelet does not respond to charging | Oxidation of contacts or pollution | Wipe the contacts with alcohol, clean gently with a toothpick |
| Charging is very slow (>4 hours) | Unoriginal charging or weak charging USB-port | Use the original charging + 5V/1A adapter |
| The bracelet heats up when charging | Short circuit or faulty battery | Turn it off immediately, check charging and contacts. |
| Charging is interrupted (indicator flashes) | Poor contact between bracelet and charging | Bending the charging contacts or replacing it |
| The bracelet shows 100%, but quickly discharges | Battery wear (capacity <50% of nominal value) | Replacement of the battery in the service center |
💡 Hidden problem: If the bracelet stopped charging after updating the firmware, try resetting it to factory settings through the Mi Fit app. Sometimes software failures block the charging process.
What to do if the bracelet is not turned on at all?
How to extend the life of the battery: 5 rules for Mi Band 2
Lithium polymer batteries in fitness bracelets degrade over time, but proper use can double their lifespan.
- Avoid full discharge. Connect the bracelet to charge at 20 to 30 percent charge. Deep discharges destroy the battery structure.
- Don't keep charging longer than you need to. Once you reach 100%, turn off the bracelet, and recharging accelerates wear.
- Store at room temperature. Extreme cold (<0°C) or heat (>40°C) reduces capacity.
- Use only original charging. Non-original devices often deliver unstable voltage.
- Update the firmware. New versions optimize power consumption (e.g. fix bugs with constant Bluetooth sync).
⚠️ Warning: If you don’t use the bracelet for a long time (e.g. in summer), store it with a charge of 40-60% in a cool place. A fully discharged or 100% charged battery loses capacity 2-3 times faster when stored.
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Optimal operating mode for maximum battery life: charge at 20-30%, turn off at 100%, avoid extreme temperatures.
Replace the battery in Mi Band 2: when it is needed and how much it costs
The average battery life in the Mi Band 2 is 2-3 years when used actively. If the bracelet holds a charge for less than a day (at the initial 5-7 days), it is time to think about replacing the battery.
- ⚡ The bracelet discharges in a few hours even without use.
- 🔄 Charging takes more than 5 hours, but the capacity is not restored.
- 📉 Mi Fit shows an incorrect percentage of charge (for example, jumps from 50% to 10%).
- 🔥 The battery swelled (seems to deform the body).
Cost of battery replacement in service centers:
- 🛠️ Official Xiaomi service: 1,500–2,500 ₽ (warranty).
- 🔧 Informal workshops: 800–1,500 ₽ (risk of poor-quality battery).
- 🏠 Self-sustained replacement: 300–600 ₽ (battery price on AliExpress).
🔧 Can you replace the battery yourself? Technically, yes, but it requires care:
- It is necessary to disassemble the body (risk of damage to the display).
- You need to solder contacts or use special connectors.
- Requires calibration of the new battery through firmware.
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If you decide to replace yourself, order a battery with a capacity of 80-90 mAh (a little more than the original 70 mAh) – this will increase the operating time by 10-15%.