Xiaomi Redmi Airdots 2 headphones remain among the most popular wireless gadgets in the brand’s lineup due to the combination of price, sound quality and autonomy. However, the question of when to charge them is often confusing: the manufacturer specifies some numbers, and real tests show others. In this article, we will analyze in detail how long it takes to fully charge both the headphones themselves and their case, and analyze factors that can speed up or slow down the process.
It's important to understand that charging times are not just dependent on the device model, but also on the charger you use, battery status, ambient temperature, and even whether you charge your headphones in a case or separately. We've gathered data from official sources, independent tests and user feedback to give you the most accurate answer.
If you’re experiencing Redmi Airdots 2 charging too long or charging too fast, you’ll find practical tips for diagnosing and fixing problems. For those just planning a purchase, we’ve compiled a comparison table with other Xiaomi models for charging time and autonomy.
Official data vs real tests: how much are charged Redmi Airdots 2 passport
According to the technical documentation from Xiaomi, the full charge of the Redmi Airdots 2 headphones in the case takes about 1.5 hours, but this value is indicated for ideal conditions: the use of the original USB-A → USB-C cable, a charger with an output of 5V/1A and ambient temperature in the range of 10-35 ° C.
Independent tests by tech enthusiasts and bloggers show slightly different results:
- 🔋 Charging headphones in the case from the original adapter: 1 hour 40 minutes – 2 hours.
- 🔌 Charging the case (without headphones) from the network: 2 hours – 2 hours 30 minutes.
- ⚡ Fast charging (from the adapter with the 5V/2A): time-limit 15–20%.
- 🌡️ Charging at low temperature (below 10)°C: time increase to 3 hours.
The difference of 20-30 minutes may seem small, but if you are used to using headphones daily, these nuances become critical. For example, when charging from a powerful adapter (5V/2.4A), the case is filled by 80% in 1 hour, which allows you to quickly prepare the gadget for use.
⚠️ Note: If your Redmi Airdots 2 charges for longer than 3 hours using the original cable and adapter, this is a reason to check the status of the battery or connector. USB-C Possible contact problems or battery degradation.
Factors affecting charging speed: from cable to temperature
Even with the same device, charging times can vary depending on the outside, and consider the key factors to consider:
| Factor. | Effect on charging time | Recommendations |
|---|---|---|
| Type of charger | 5V/1A vs 5V/2A Adapter: Up to 30% difference | Use an adapter with a output of at least 5V/1.5A. |
| Cable | Non-original cables can limit current to 0.5A. | Prefer certified USB-C cables with Fast Charge support. |
| Temperature. | Below 10°C or above 35°C: 20–50% increase in time. | Charge at room temperature (20–25°C). |
| Battery status | After 300 charging cycles, the capacity drops by 15-20%. | Calibrate the battery every 3 months (full discharge + charge). |
| Use during charging | Connecting to your phone while charging increases the time by 10-15 minutes. | Turn off the headphones from the devices while charging. |
Critical nuance: if the Redmi Airdots 2 case does not charge at all when connected to the adapter, but is charged from the device. USB-The problem with the PC port is the power supply or the cable, not the headphones themselves.
How much are charged headphones separately from the case: myths and reality
Many users mistakenly believe that Redmi Airdots 2 can be charged directly, without a case, but it is not true: the headphone design does not provide a separate connector for connecting the cable. Charging is possible only through contacts in the case.
However, there is a caveat: if you removed one headphone from the case, and left the second inside, then:
- 🎧 The headphone in the case will be charged with standard 1.5-2 hours.
- 🔄 The case discharges faster, as it gives energy to only one earpiece.
- ⚠️ If you leave the headphone outside the case for a long time, its battery will discharge to 0% in 4-6 hours (due to background consumption).
Fun fact: Redmi Airdots 2 has an automatic power out when the headphones are fully charged, which protects the battery from overheating, but can create the illusion of "fast charging" if you check the status at short intervals.
What if one headphone charges longer than the other?
How to speed up the charge Redmi Airdots 2: 5 working ways
If you need to prepare your headphones for use as quickly as possible, use these tips:
Use the adapter with the output 5V/2A higher|Disable headphones from all devices via Bluetooth|Charge at room temperature (20–25°C)|Use the original cable USB-C|Do not interrupt the charging process until 100% (first 80% charge faster)-->
One of the most effective methods is to use a Quick Charge adapter, such as the Xiaomi Mi 10 (5V/3A) charger, which reduces the charge time of the case to 1 hour 20 minutes, but it is important to make sure that the cable maintains such current (conventional cables can overheat).
Another life hack: if you need to use headphones urgently and they are discharged, connect the case to charge for 15-20 minutes, during which time the headphones will have time to charge 30-40%, which is enough for 1.5-2 hours of listening to music, this method is especially useful if you forget to charge the gadget at night.
⚠️ Note: Do not use adapters with higher output voltage 5V (for example, 9V/2A This can damage the case charger, as Redmi Airdots 2 Do not support fast charging technology above 5V.
Xiaomi’s other models: Who is charging faster?
For clarity, we have compiled charging times for popular Xiaomi wireless headphones in one table, which will help us to assess how much Redmi Airdots 2 compares (or is inferior) to competitors within the brand.
| Model | Time to charge headphones in the case | Case charging time | Autonomy (clock) |
|---|---|---|---|
| Redmi Airdots 2 (2020) | 1.5 hours to 2 hours | 2.5 hours | 4 (earphones) / 12 (with case) |
| Xiaomi Mi True Wireless Earbuds 2 | 1 hour | 1.5 hours | 5 / 14 |
| Redmi Buds 3 Pro | 1 hour 10 minutes | 1.5 hours | 6 / 28 |
| Xiaomi FlipBuds Pro | 1 hour 30 minutes | 2 hours | 7 / 20 |
| Redmi Buds 4 Active | 1 hour | 1.5 hours | 5 / 20 |
As you can see from the table, Redmi Airdots 2 is not the leader in charging speed, but it is not too far behind. Their main advantage is the ratio of price to autonomy. For example, Redmi Buds 3 Pro charge faster, but also cost 2-3 times more.
If you are critical to charging speed, look for models that support wireless charging (for example, Xiaomi Mi True Wireless Earbuds 2).They allow you to charge a case without wires, which is convenient on the road or at work, where there is no access to the outlet.
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To extend the battery life of Redmi Airdots 2, avoid full discharge (below 5%) and do not keep the headphones on charge for more than 3 hours after reaching 100%.The optimal charge range for lithium polymer batteries is 20-80%.
Frequent charging problems and their solutions
Even reliable devices like Redmi Airdots 2 can have charging problems, and let’s look at typical scenarios and how to fix them:
- 🔌 The case is not charging from the adapter but is charging from the PC: The problem is the power supply or cable.Try another adapter with the output 5V/1A If it doesn't work, check the connector. USB-C case-case for contamination or damage.
- 🎧 One earphone is charging, the other is not: Clean the contacts on the earphone and in the case with a cotton swab dipped in alcohol. If the problem persists, a wire may break inside the earphone (requires repair).
- ⚡ Case charges very slowly (over 4 hours): Most likely, the case battery has degraded. Try resetting the case settings (hold the button on the case for 10 seconds until the indicator flashes).
- 🔋 Headphones discharge quickly after charging: Calibrate the battery: completely discharge the headphones, then charge to 100% without interruption. Repeat the procedure 2-3 times.
If neither method worked, it may require a battery or charging controller replacement, which costs between 800 and 1,500 rubles (2026) in Xiaomi service centers, often cheaper than buying new headphones.
⚠️ Warning: Do not use abrasive materials (such as sandpaper) or acetone-based liquids to clean contacts. This can damage the protective coating and lead to corrosion.
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If the Redmi Airdots 2 case stopped charging after falling or getting moisture, don't try to disassemble it yourself. There are small cells inside, and the battery may be bloated.