Xiaomi smartwatches and fitness bracelets have become an integral part of the daily lives of millions of users. From the Mi Band 8 to the flagship Xiaomi Watch S3, these devices require the right handling of the battery to last as long as possible. However, many owners face problems: the watch discharges in a few hours, does not turn on after charging or completely stops holding the charge.
In this article, we will analyze all the nuances of charging Xiaomi smart watches – from the choice of charger to the intricacies of operation at low temperatures. You will learn how to properly connect the Mi Band 7 Pro to a magnetic docking station, how long it takes for the Watch 2 Pro to fully charge, and why you can’t leave the device on charge all night. Special attention will be paid to the unique problems of models 2023-2026, such as the error of “50%” on the Mi Band 8 Active or slow charging of the Watch. S2 wirelessly.
The material is based on official Xiaomi recommendations, tests of the DXOMark lab (the wearables section) and the experience of service centers. If your watch is running too fast or not charging at all, here you will find a solution.
1.What Chargers Are Suitable for Xiaomi Smart Watches
The first rule of a long battery life is to use original or certified chargers. Xiaomi completes its watches and bracelets with special docking stations that take into account the current and voltage optimal for low-capacity lithium polymer batteries.
- 🔌 Magnetic docking stations (for Mi Band) 5/6/7/8, Watch S1/S2): They have two contacts and they're magnetically fixed, and fakes often don't match in polarity, which leads to errors "E1" screen-on.
- ⚡ Wireless charging (for Watch 2 Pro, Watch) S3): Supports the Qi standard but requires at least a minimum of power 5W. Charging from smartphones (such as the Redmi Note 12) may not be suitable due to the shape of the device.
- 🔋 USB-cables: for models with a Type-C connector (for example, Mi Watch Revolve Active) any high-quality cable is suitable, but the power supply must give out a high-quality cable. 5V/1A.
⚠️ Warning: Using charging from other brands (such as Apple Watch or Samsung Galaxy Watch) could cause the battery to overheat.In 2023, Xiaomi released a firmware update for the Watch S2, blocking charging from uncertified devices – the screen appears a warning “Unsupported charger".
| Model clock | Type of charging | Max. power (W) | Full charge time. |
|---|---|---|---|
| Mi Band 8 | Magnetic docking station | 2.5 | 1 hour 20 minutes |
| Xiaomi Watch S3 | Wireless (Qi) | 5 | 2 hours |
| Mi Watch Revolve | Type-C cable | 3.5 | 1 hour 45 minutes |
| Redmi Watch 3 Active | Magnetic docking station | 2 | 2 hours 10 minutes |
2. Step-by-step instructions: how to charge a Xiaomi smart watch
The charging process seems simple, but even here there are pitfalls.
- Preparation: 🧹 Clean the contacts on the watch and docking stations of dust and sweat with a dry wipe.Wet wipes or alcohol can damage the coating. 🔄 If the watch does not respond to the connection, reboot it (hold the 10 seconds button for the Watch). S2).
- Connection: 🧲 For magnetic docking stations: combine the contacts before clicking. The charging indicator (red or green) should light up on the Mi Band 8). 🔄 For wireless models: Put the clock on the station with a display up (the Watch 2 Pro has a tag on it "TOP").
Control of the process:
- ⏳ The first 20 minutes of charging is 1% per minute, then the rate drops.
- 📱 Track progress in Mi Fitness or Zepp Life (Device section) → Battery status").
3.How long does Xiaomi smartwatch charge?
The charging time depends on the model, battery capacity and type of charger, and the manufacturer specifies the data for the original accessories and the temperature of 20-25°C. The real tests show the following results:
- ⚡ Mi Band 8 (190 mAh): 0 to 100% in 1 hour 15 minutes (magnetic docking station).
- ⏳ Xiaomi Watch S3 (470mAh: 0 to 100% in 2 hours (wireless charging).
- ⚡ Redmi Watch 3 Active (200mAh): 0 to 100% in 1 hour 50 minutes.
- ⏳ Mi Watch Revolve (420 mAh): 0 to 100% in 1 hour 40 minutes (Type-C).
Why can the charging go longer?
🔋 Expert advice: To speed up the charging of the Watch S2 watch S3, Turn off the “Constantly Active Screen” function in the settings (Settings) → Display. That'll cut the time by 15 to 20 minutes.
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If the Mi Band watches charge too long (over 3 hours), try resetting to factory settings via the Mi Fitness app, which solves the problem of the power controller freeze in 70% of cases.
4.Typical charging errors and how to avoid them
Even experienced users sometimes make mistakes that shorten battery life.
- 🔥 Overheating: Charging under direct sunlight or near heat sources (e.g. on a laptop) causes battery degradation.Optimum temperature: 15-30°C.
- 🔌 Use of "fast" charges: power supplies on 18W+ (For example, the Redmi Note 11 Pro can damage the power controller in the watch — 5W.
- 📵 Charging through USB-PC port: Voltage in USB 2.0 ports are often not stable enough, causing the Watch to “Charging paused” error. S3.
- 🔋 Storage discharged: If you leave the watch with 0% for a few days, the battery can fall into a “deep discharge” and stop holding the charge.
⚠️ Attention: Mi Band 8 and Watch S2 There's a bug: if you interrupt charging by 50% (e.g., turn off the power), the watch can show 100%, but actually only charge to 60-70.
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The most common reason for battery failure in Xiaomi smartwatches is the use of non-original chargers with the wrong polarity of the contacts. This leads to short circuit and battery bloating.
5. How to extend the life of the smartwatch battery
The lithium-polymer batteries in Xiaomi smartwatches are designed for 300-500 charging cycles (depending on the model), after which the capacity drops to 70-80% of the original. To delay this point as much as possible, follow these recommendations:
- 🔄 Avoid full discharge: Connect the watch to charging at 15-20%. Deep discharge (0%) reduces battery life by 10-15 cycles.
- 🔋 Don't keep on charging constantly: Once you reach 100%, turn off the watch.In Watch models S3 Mi Band 8 has a recharge protection, but it doesn’t always work.
- 📱 Update the firmware: In versions older than 2023.10 for the Mi Band 7 was an error, which caused the watch to spend charge in standby mode 30% faster.
- ❄️ Avoid Extreme Temperatures: Charging at 0°C or 40°C can damage the battery without recovery.
- Check the firmware: 📲 Update the software via Mi Fitness or Zepp Life. In versions older than 2023.05, there was a bug with the recognition of chargers. ⚠️ Note: If the Xiaomi Watch S3 They show "Charging paused," which means that the battery temperature is out of normal, so let the device cool down to 10 to 35.°C and try again. 💡If the watch doesn't charge after resetting, try holding it in the dock for 10-15 minutes without even an indication. Sometimes the power controller doesn't wake up right away. 7. In 2026, Xiaomi released several updated models with new types of batteries and charging stations: 🆕 Xiaomi Watch S4: supports wireless charging power 7.5W (against 5W watch S3). Full charging takes 1 hour 30 minutes. 🔋 Mi Band 9: Battery capacity increased to 210 mAh, but charging remained magnetic (compatible with stations from Mi Band 8). ⚡ Redmi Watch 4: Uses a universal docking station compatible with Redmi Watch 3 and Mi Band 7. 🔍 Important Update: In firmware 2026.03 for Watch S3 Added Adaptive Charging, which automatically limits current at high temperatures, which has increased battery life by 15 percent, but also has led to charging up to 100 percent now taking 20 minutes longer. 💡For models from 2026 (Watch) S4, Mi Band 9) Xiaomi recommends using only original chargers. Otherwise, the battery warranty is reduced from 12 to 6 months (FAQ) ❓ Can I charge Xiaomi smartwatches from power bank: 🔋 Power Bank must support the output current 1A (Xiaomi Mi Power Bank 3 on the 18W). ⚡ Avoid cheap models without protection from voltage surges – they can damage the power controller. 📱 On Watch. S2 When charging from power bank, a warning “Slow charging” may appear – this is normal. ❓ Why Xiaomi Watches Are Only Charged 80% And they stop? This is a security feature that's included in the firmware after the 2023.09. It extends the battery life by limiting the maximum charge to 80–85%. To disable: Open the Zepp Life app. Go to Profile → The device → Battery settings. Turn off the option "Optimized Charging". ❓ How to charge a Xiaomi smart watch without native charging? In extreme cases, you can use it: 🔌 Type-C (Mi Watch Revolve) models: any cable USB-C powered 5V/1A. 🧲 For magnetic docking stations (Mi Band): Charging from Huawei Band is suitable 6 Honor Band. 5 (contact). ⚡ For wireless models (Watch) S3): Qi-charged power 5W+, But you need to precisely combine the coils. ⚠️ Risk: Unoriginal charges can cause overheating or battery calibration error ("Battery error"). ❓ How long does the battery last in a Xiaomi smartwatch? Service life depends on the model and operating conditions: Model Average life (cycles) Capacity in 2 years Mi Band 8 400-450 85-90% Xiaomi Watch S3 350–400 80–85% Redmi Watch 3 300–350 75–80% 🔋 To extend life: Avoid charging to 100% and discharging to 0%. Store the watch at 40-60% charge if you don't use it for long periods. Update the firmware - new versions optimized charging algorithm. ❓ Is it OK to use a Xiaomi watch while charging? Technically yes, but there are nuances: ✅ Mi Band 8: You can wear it on your hand, but your movements can interrupt contact with the dock. ❌ Xiaomi Watch S3: not recommended – wireless charging requires a stationary position. ⚠️ All models: When used actively (e.g. during exercise), the battery temperature rises, which can cause charging to stop.