How to charge Redmi AirDots 2 without a case: a guide

Owners of Xiaomi Redmi AirDots 2 wireless headphones often face the unpleasant situation when the charging case suddenly fails or is lost. This creates a sense of hopelessness, because the standard use case involves putting the gadget in a box to store energy.

Before we start experimenting, it's important to understand the architecture of the device. Inside each Mi True Wireless Earbuds Basic 2 headphone is a small-volume lithium polymer battery that is normally charged through the contact pads on the case. These contacts are pinned inside the case, forming a single circuit. Breaking this circuit requires design intervention or the use of specific workarounds, which will be discussed later.

It is important to note that most methods without the original boxing are of an emergency nature and do not guarantee long-term stability of the device. Direct connection to the battery or contacts requires caution, as the risk of short circuit or overheating remains high. In this article, we will discuss in detail the physical methods of supplying current, the necessary tools and precautions.

⚠️ Warning: Any manipulation of opening the case or direct contact with the battery may result in the device finally breaking down and warranty cancellation.

Design and access points for charging

To successfully complete the charging task without a standard case, you need to clearly understand where the electrical entry points are. In the Redmi AirDots 2, as in many other models. TWS-Headphones, no external ports USB Or Lightning. The only way to transfer power inwards is through contact sites hidden under magnets or placed on the end of the legs of the device.

If you look at the bottom of the headphone, you can see two little gold or copper contacts, and that's where the charge controller inside the device regulates the current. Normally, the case delivers 5 volts, but when you connect directly, you'll have to provide a stable voltage, which is the hardest part of the process.

Disassembling the case also opens up access to the battery itself, but it requires jewellery precision. Inside the compact space is a miniature power cell, usually labeled as Li-Po. It will require fine tweezers and possibly a microscope or a magnifier to avoid damaging the plumes or the battery itself when extracted.

• 🔍 Two contact pins on the headphone body – the main interface for energy transfer.
• 🔋 Built-in lithium-polymer battery – an energy source that requires careful handling.
• 🔌 Power controller – a chip that controls the charging process and protection against overload.

Direct connection method through the contact body

The most common way to reanimate Mi True Wireless Earbuds Basic 2 without a case is to simulate the operation of the case by direct contact with the pins on the headphone. To do this, you will need a DC source with the ability to finely adjust voltage and current, for example, a laboratory power supply or USB-cable with cleaned wires and battery (as a temporary solution).

The process requires you to lock the earpiece in a still state. You can use plasticine or a special holder. Then you need to clean the ends of the wires and gently apply them to the contact areas, observing polarity. Positive wire usually corresponds to the right contact (if you look at the earpiece), but you should check with a multimeter or a test short pulse.

The main challenge is to keep the contact stable for an hour or two. The slightest shift will cause the charging cycle to be interrupted, and the controller may not recognize the connection. Some wizards use thin copper plates or foil to press them against the contacts with a load, but this is risky because of the possible overheating of the contact point.

It should be remembered that without a smart case scheme, which usually tells the earbud about the start of charging, the device may not immediately react to the connection. The indicator on the case may not catch fire immediately, so it is important to control the process visually and tactilely, monitoring the heating.

Charging directly from the battery

If the external contacts are damaged or oxidized, the radical method is to remove the battery and charge it separately from the headphone board, which requires a complete disassembly of the device, which for the Xiaomi Redmi Airdots 2 is a difficult task because of the adhesive connection of the halves of the body.

After a neat opening (often by heating with a hairdryer and a thin blade), you will access the board and battery.The battery is connected to the board via a tiny connector or solder. By disconnecting it, you can connect the battery to a universal charger for Li-Po batteries, setting currents no higher than 0.1C (roughly 4-5mA for such a capacity).

This method is extremely dangerous for inexperienced users: Lithium polymer batteries are sensitive to mechanical damage, puncture and overheating. In addition, when assembled back, there is a high risk of damaging the speaker membrane or impairing the tightness, which will lead to sound deterioration or moisture entering the interior.

⚠️ Warning: Never try to charge a retrieved battery by plugging it directly into a power outlet or a regular battery. USB-A block without a controller is guaranteed to cause an explosion.

Use of a wireless charging coil

There is a theoretical possibility to modify headphones to support wireless charging if not originally provided, or to use an induction coil to transfer power inside the case without physical contact. For Redmi AirDots 2, this means inserting a thin receiving coil inside the case connected to the board contacts.

This is more suitable for modding enthusiasts than for conventional repairs, and you'll need to find a super-thin coil that fits in the free space inside the headphone and adjust it to the input voltage of the controller, and standard wireless charging won't work here because of the size.

It takes a long time to do this, and it requires chip soldering skills, but if you successfully implement the coil, the problem of charging without a case will be solved forever, you just need to put the headphone on any wireless panel. But is the game worth the candle, given the cost of components and labor?

It is important to consider that the introduction of foreign elements can disrupt the weight balance and fitting of the earphone in the ear, as well as shield the Bluetooth signal if the coil is located unsuccessfully.

Required tools and materials

You need a specific set of tools to implement the methods described above, and you don't have to rely on the tools you can use, because microelectronics requires precision, and you need a high-quality power supply that adjusts voltage and current.

Also indispensable will be thin wires, a thin sting iron, flux and solder, and you'll need plastic shoulder blades, suction cups and possibly a medical scalpel to fix and disassemble the case, and don't forget the multimeter to test polarity and voltage in real time.

• 🛠️ Laboratory power supply or USB-tester.
• 🔌 Fine copper wires or conductive glue for contacts.
• 🧲 Holder or vise for fixing a miniature device.
• 📏 Multimeter for monitoring the parameters of electric current.

If you don't have experience with electronics, it's better to buy a cheap analogue of a charging case at sites like AliExpress than risk an expensive device. However, if the goal is to experiment or save data, having the right tools is critical.

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Use tape or shrinkage to isolate the joints so that you don’t accidentally close the contacts with your fingers or tool during the process.

Frequent errors and security measures

When you try to charge Xiaomi Redmi Airdots 2 with non-standard methods, users often make fatal mistakes. The most common of them is ignoring polarity. By confusing the plus and minus, you can instantly disable the charge controller or the battery itself, after which recovery becomes impossible.

Another mistake is to use too much current in the hope of charging the device faster, which is like death for small batteries: they heat up, swell up and can flow, the charge current should be minimal, the process will take longer, but save the battery life.

Also dangerous is overheating of the case. If you use soldering or hold wires with your hands, the temperature can rise. Watch for the condition of the plastic: if it begins to melt or change color, immediately stop the power supply. Safety should always come first.

⚠️ Warning: Do not leave the charging process unattended for a minute. In case of thermal acceleration of the battery counts for seconds.

Alternative solutions and conclusions

If neither method worked or seemed too risky, it is worth considering alternatives: Buying a new charging case (original or compatible) is often cheaper than potentially repairing or buying new headphones.

In some cases, the problem is solved by replacing the battery itself if the old one is several years old and physically degraded, but for the Redmi AirDots 2, the cost of a new battery with delivery may exceed the cost of the entire device, making repairs economically inefficient.

To sum up, it's possible to do this without a case, but it requires technical skills and special equipment, it's a solution for emergencies or for enthusiasts, but not for everyday use. Take care of your gadgets and try not to lose original accessories.

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The most reliable way to charge without the original case is to simulate its operation through direct connection to contacts with strict 5V voltage control.

FAQ: Frequently Asked Questions