Xiaomi AirDots 2 wireless headphones (also known as Mi True Wireless Earbuds 2) remain among the most popular. TWS-But many users are faced with questions like how long the case and the headphones need to be charged, how do you know when the charge is complete, and why can the battery go down faster than expected? In this article, we will break down all the nuances of charging AirDots 2, including official recommendations, practical tips and common mistakes that reduce battery life.
It’s important to consider that charging time depends on several factors: the type of charger, current charge level, ambient temperature, and even battery age. We tested different scenarios and collected data in handy tables so you can determine exactly how long it will take for you, and you will learn how to properly “accelerate” a new headphone battery (this is true for the first 3-5 cycles of charging) and what to do if the case or headphones stop charging.
Official data: charging time from Xiaomi
According to the manufacturer’s specifications, Xiaomi AirDots 2 is equipped with lithium polymer batteries with a capacity of 40 mAh in each earphone and 300 mAh in the charging case.
- 🔋 Charging headphones in the case: ~1.5 hourly 100% (When using the original cable and adapter 5V/1A).
- 🔌 Charging the case: ~2 hours to full charge (0% to 100%).
- ⚡ Fast charging: 10 minutes in the case give ~1 hour of playback (with discharged headphones).
- 🎧 Autonomy: up to 4 hours of continuous playback on one charge of headphones, up to 12 hours, taking into account the recharging from the case.
But these are ideal lab numbers, and in real life, the time can vary by 10 to 30 percent depending on:
- 🔌 Charger power: Adapters with higher current 1A. For example, 5V/2A) They can reduce the time of the case charge on 15–20 minute.
- 🌡️ Temperatures: when charging below +10°C or higher +35°C charge rate drops and battery wear accelerates.
- 📱 Battery state: After 300–500 charging cycles, battery capacity decreases by 15–20%, which increases charging time.
How to charge Xiaomi AirDots 2: Step-by-step instructions
To avoid battery problems, follow this charging algorithm, which takes into account Xiaomi recommendations and user experience:
- Check the charge level: there are 4 LEDs on the case showing the charge of the case (each = 25%). If all 4 are on fire, the case is 100% charged. Headphones only have an indication when connected to the case: red light - charging, white - full charge.
- Use the original cable: the USB Type-C cable from the kit supports optimal charging current. Cheap cables may not provide the required power.
- Connect the case to the power supply: use a 5V/1A or 5V/2A adapter. Charging from a PC (USB 2.0) can take 30-40 minutes longer.
- Close the case cover, the headphones will start charging automatically. If the headphones are not on, check their position in the nests.
- Wait for full charging: the case and headphones can be used already at 80% charge, but for calibration of the battery it is recommended to bring to 100% at least once every 2-3 weeks.
Clear the case and headphone contacts from dust | Check the integrity of the Type-C| Use the adapter with an output of 5V/1A or 5V/2A| Do not charge at temperatures below +5°C or above +40°C | Do not interrupt charging in the first 30 minutes-->
If the headphones are not charging, try the following steps:
- Reboot the case: remove the headphones, press and hold the button on the case for 10 seconds until the indicators go out.
- Clean contacts: wipe the metal contacts in the case and on headphones with a cotton swab soaked in alcohol.
- Check the cable and adapter: try charging the case from another source.
⚠️ Note: Do not use wireless charging stations for AirDots 2 – this model does not support Qi technology. Attempts to charge the case on a wireless stand can lead to overheating and battery failure.
How much does Xiaomi AirDots 2 really charge?
We have tested the autonomy of Xiaomi AirDots 2 In different modes, to show real numbers (not the lab data from the manufacturer), all tests were conducted on firmware headphones. V4.7.1_20210315 and volume level 70%:
| Mode of use | The operating time of the headphones (from the battery) | Casework time (full cycles) | Notes |
|---|---|---|---|
| Music Playback (AAC) | 3 hours 45 minutes | 11 hours 10 minutes (3 full cycles) | Loudness 70%, no ANC |
| Phone conversations | 4 hours 20 minutes | 12 hours 30 minutes (2.8 cycles) | Headphone microphone used |
| Games (low delay) | 3 hours 10 minutes | 9 hours 40 minutes (3 cycles) | Game Mode in MIUI |
| Simple (connected to the phone) | 6 hours | 18 hours | No reproduction, only connection. |
Note: If you use SBC codecs (the default codec in Android), the uptime can increase by 10-15% compared to AAC.
- 📶 Communication system: in the area of weak Bluetooth signal (for example, in the subway), headphones spend more energy on maintaining the connection.
- 🔊 Volume: at a maximum (100%), the working time is reduced to 2.5-3 hours.
- 🌡️ Temperature: at -10°C battery sits in 2 faster than that, and +40°C possible overheating and disconnection.
💡
To extend the time, turn off the Autoconnection function in the Bluetooth settings on your smartphone. This will prevent the headphones from constantly scanning with background processes.
Frequent charging errors and how to avoid them
Many users are inadvertently shortening the life of AirDots battery 2, Follow common myths or neglect simple rules.-5 errors and their consequences:
- Charging on the go: connecting the case to power for 5-10 minutes several times a day instead of a full cycle leads to the memory effect - the battery "remembers" an incomplete charge and loses capacity.
- Use of non-original cables: Cheap cables may not provide stable voltage, causing the charging controller to micro-reboot.
- Storage discharged: If you leave your headphones or case with a charge below 10% per month, the battery can fall into a deep discharge and stop charging.
- Charging at extreme temperatures: for example, leave the case in the sun in the car in the summer or charge in the cold in the winter.
- Ignoring firmware updates: Newer firmware versions often optimize battery management algorithms.
How to avoid these mistakes:
- 🔄 Charge your case to 100% at least once a week, even if you rarely use headphones.
- 🔌 Use only certified cables with support USB 2.0 or higher.
- 📱 Update your firmware regularly through the Mi Home or Xiaomi Wear app.
- 🌡️ Avoid charging at a temperature below +5°C and above. +35°C.
⚠️ Note: If the case or headphones started to heat up strongly during charging (above) +50°C, immediately disconnect them from the power supply, this may indicate a faulty charging controller or bloating of the battery, in which case do not use the device until the diagnosis in the service center.
How to extend the battery life of Xiaomi AirDots 2
The Lithium Polymer batteries in AirDots 2 are designed for 300 to 500 full charge cycles (0% to 100%) and then start to drop by 1-2% per month, but with proper care, you can extend battery life by 20 to 30%.
- 🔋 Calibration of the battery: once every 2-3 months completely discharge the headphones and case (until automatic shutdown), then charge up to 100% without interruptions.
- 📉 Avoid deep discharge: try to recharge the case when 1-2 indicators remain (25-50% charge).
- ☀️ Keep it in a cool place: optimal storage temperature — +10...+25°C. Do not leave headphones in the car or on the windowsill.
- 🔄 Alternate headphones: if you use only one headphone (for example, at work), periodically recharge the second one so that their batteries wear out evenly.
It is also useful to disable unnecessary functions that consume charge:
- 🎵 Autopause when retrieving: If you often pull out headphones, this feature can waste up to 5% of charge per hour.
- 📡 Continuous Bluetooth scanning: in smartphone settings, turn off background scanning to save energy.
- 🔊 Noise reduction (if any): even passive noise cancellation increases the load on the headphone processor.
What to do if the battery is running down quickly?
Comparison with other Xiaomi models: which is better?
If you’re considering buying AirDots 2 or are already using them, it’s helpful to compare them to other popular Xiaomi models on key charging and autonomy parameters:
| Model | Battery capacity (earphones/case) | Case charging time | Autonomy (headphones / with case) | Support for fast charging |
|---|---|---|---|---|
| Xiaomi AirDots 2 | 40 mAh/300 mAh/h | ~2 hours | 4 h/12 h/ | No. |
| Redmi AirDots 3 | 43 mAh/400 mAh/h | ~1.5 hours | 5 h/20 h/ | Yes (10 min = 1.5 hours of playback) |
| Xiaomi Air 2 Pro | 55 mAh/500 mAh/h | ~1.5 hours | 7 h/25 h/ | Yeah (wireless charging) |
| Xiaomi Buds 4 | 55 mAh/500 mAh/h | ~1 hour | 6 h/30 h/ | Yeah (Qi and fast charging) |
As you can see from the table, AirDots 2 is losing out to newer models in battery capacity and charging speed, but they remain relevant because:
- 💰 Price: one of the most affordable models in the line Xiaomi.
- 🎵 Sound quality: Despite age, sound remains balanced for its class.
- 🔄 Repairability: Replacing batteries or speakers is cheaper than newer models.
If autonomy is critical for you, consider Redmi AirDots 3 or Xiaomi Buds 4 – they offer 2-3 times more time without recharging.
💡
For most users, AirDots 2 is a full-time (8-10 hours) charger, with case recharging, and if you need more, look for models that support fast charging.