Xiaomi’s popular Redmi AirDots 2 wireless headphones (also known as Mi True Wireless Earbuds Basic S) have earned the love of users due to their compact size and affordable price, but questions about their power supply arise regularly. Proper charging of the case and the headphones themselves is the foundation for their long service, since lithium-ion batteries are sensitive to overload and deep discharge. In this article, we will discuss in detail the process of replenishing energy, indicators and typical problems that you can face.
Many users mistakenly believe that the process of connecting to the network is trivial, but there are nuances that can cause the power controller to fail, such as using too powerful power supplies from smartphones can damage the tiny battery inside the case. It is also important to understand the difference between the indication of charging the case and the headphones inside it, so as not to panic when the LEDs blink.
Not only will we look at the standard cable connection scenario, but we will also look at how to charge the Xiaomi Redmi AirDots 2 without a case in an emergency, why the indicator can burn red even after several hours on the network, and what to do if the left or right earphone stops responding to the on command.
Preparation for charging and choice of power source
Before you connect Xiaomi Redmi AirDots 2 to the power grid, you need to make sure that the accessories used are serviceable. The complete cable is a short Micro-USB cord that is designed solely for charging a case, and not for data transfer or connecting to a computer as an audio device. The use of damaged or poor-quality wires often causes the device to not charge at all.
It is critical to choose the right current source. Although modern gadgets can regulate current, low-cost electronics like AirDots 2 may not have full protection against overheating at high currents. A power unit labeled 5V/2A or higher is theoretically safe, but practice shows that it is better to use USB ports of a computer or old units with current 1A. This will provide a more gentle charging mode for a small battery.
⚠️ Warning: Never use Quick Charge, SuperCharge, Power Delivery power supplies without a controller unless you are sure they are compatible. High voltage can irreversibly damage the power circuit inside the case.
Visually inspect the Micro-USB connector on the bottom of the case, which often gets pocket dust and pile, which prevents close contact. Before connecting the cable, gently blow the connector or clean it with a dry toothpick, without using metal objects, so as not to close the contacts.
Step-by-step instruction for case charging
The process of replenishing the energy in the case Xiaomi Redmi AirDots 2 is as simple as possible, but requires following a certain sequence of actions to correctly operate the indicators. First, make sure that the headphones are inserted into the sockets of the case if you want to charge them at the same time, or remove them if the goal is to charge only the case itself.
☑️ Pre-charging check
Connect the smaller end of the cable (Micro-USB) to the connector at the bottom of the case. You should hear a slight click, meaning that the connector has entered to the end. USB-At which point the LED light on the front of the case will light up in red, signaling the beginning of the process.
If the light goes off, the current goes into the battery. Leave the device alone until the cycle is complete. On average, it takes about 1.5 hours to fully charge an empty case. It is not recommended to interrupt this process often, as this can interfere with the calibration of the battery controller.
Indication and charging time
Understanding LED signals is key to controlling the device. Redmi AirDots 2 uses a single-color LED that changes modes depending on the state of the system. Red light always means that there is an active charging process, and white or no glow indicates the end or absence of connection.
And it's important to note that the indicator on the case shows the charging status of the case, not the headphones inside, unless you just put in the dead headphones. When the case is fully charged, the red light goes out. If you put the dead headphones in the charged case, the indicator can briefly light up red, indicating that the headphones are being charged from the battery case.
| Status of the device | Color of indicator | Mode of work | User actions |
|---|---|---|---|
| Case on charge. | Red (constantly) | Charging's coming. | Waiting. |
| Case loaded. | Gasnet | Ready to work. | Shut off the network. |
| Headphones in the case | Red (flashing) | Charging headphones | Check the contact |
| Low-charge headphones | Red (voice) | Battery discharge | Put it in the case. |
The headphones themselves have a battery life of about 4 hours of continuous music listening. The case is able to fully charge them about 3-4 times, which gives a total use time of up to 16 hours. These are standard indicators for devices in this class with a 40 mAh battery in each earpiece.
Charging headphones inside the case
The main use case involves charging Xiaomi Redmi AirDots 2 directly in the case, you need to place the headphones in the appropriate recesses, magnets must attract them and lock them in the correct position, ensuring contact charging pins on the headphones with the feedback contacts inside.
If you insert the headphones correctly, the LED on the case can flash or light up red if the case itself is connected to the network at that moment. If the case is not connected to the network, the indicator may not respond, but the headphones will start charging from the built-in battery of the case. Make sure that nothing interferes with the tight fit of the case cover.
Why don't the headphones charge in the case?
There's an important caveat: if the headphones are discharged to zero, they may not start charging right away. Leave them in a connected case for 10-15 minutes. Sometimes it takes a shock to activate the charge controller inside the miniature headphone battery.
Can I charge Redmi AirDots 2 without a case?
The question of how to charge Xiaomi Redmi AirDots 2 without a case arises often, especially if the case is out of order or lost. The design of these headphones does not provide an external cable connector. The only way to supply power is through contact pads, which normally close on the case.
Theoretically, you can charge them using third-party wireless headphone chargers or make an improvised connector. However, this method requires extreme caution and technical skills. You need a 5 volt power supply and thin conductors that need to be gently held to the contacts on the end of the earphone.
⚠️ Warning: Trying to charge your headphones directly without a case carries the risk of short circuit. Wrong polarity or a power surge will instantly disable the device without the possibility of recovery.
A safer, but more time-consuming way is to use a wireless charging coil if you modify the headphones themselves by sticking a coil to them, but that will permanently disqualify you and break the seal of the case, so if the case is broken, it's more rational to buy a new original or compatible case than to risk the integrity of the lithium battery.
Typical problems and their solution
Owners of Xiaomi Redmi AirDots 2 may experience a situation where the indicator is lit red, but the charge does not go, or the device does not turn on after a long downtime. Often the problem lies in the "stick" of the battery. If the headphones were long lying discharged, the chemical processes inside the battery could lead it to a state of deep sleep.
In this case, the rocking method helps. Leave the case with headphones on charging for a few hours, even if the indicator is behaving strangely. Sometimes it takes up to 30 minutes for the battery voltage to rise to the minimum threshold after which the control circuit will allow normal charging.
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If one earphone is charging and the other is not, try swapping them in the case to help you understand if the problem is in a particular earphone or in the contact group inside the case.
Cheap Micro-USB cables often have only two working veins (for charging), but do not have the shielding or additional contacts necessary to work stably with some controllers. Replacing the cable with a quality counterpart solves the problem in 80% of cases.
Operational rules for extension of service life
To keep your Xiaomi Redmi AirDots 2 long, it’s important to follow the rules of operation of lithium-ion batteries. Don’t leave the device on charge for longer than necessary after the indicator has gone out. Although modern controllers cut off current, a constant connection to the network creates microscopic charging cycles that wear out the battery.
Avoid extreme temperatures. Don't leave your headphone case in the sun in your car or on the windowsill in the summer. Overheating above 45°C is critical for battery chemistry and can cause swelling or loss of capacity. The same applies to frost - in the cold, the device may temporarily stop working, but after warming, the functionality usually recovers.
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The optimal charge level for long-term storage of headphones is about 60-70%. Do not store completely discharged devices for months, this leads to irreversible battery degradation.
Clean the case regularly, moisture that enters the case with the headphones after training can cause corrosion of the contacts, wipe the inside of the case with a dry cloth at least once a week to ensure reliable contact and stable charging.