Replacement of the battery in wireless headphones Xiaomi: a complete guide with photos and tips

Xiaomi’s wireless headphones are some of the most popular gadgets on the market, thanks to a combination of price, sound quality and autonomy. 2, Redmi Buds 3 Pro, Mi True Wireless 2) They start to run out in a matter of hours or refuse to hold a charge at all, because of the degradation of lithium polymer batteries, which on average serve as batteries for the first time. 2-3 year with active use.

Many users mistakenly believe that headphones with a faulty battery can only be thrown away. In fact, replacing a battery is a complete task even for beginners, if you approach it with patience and the right tools. In this article, we will analyze the entire process from A to Z: from diagnosing the problem to testing after repair, you will learn what tools you need, where to buy original batteries, how to avoid typical soldering errors and how to avoid damaging the microphone or speaker.

⚠️ Important: If your headphones are still warranty, self-repair will cancel it. In this case, it is better to contact the Xiaomi service center - they will perform a battery replacement for free when confirming a factory defect.

1.How to understand that the headphone battery Xiaomi it’s time to change

Before you take on the soldering iron, make sure that the problem is the battery. The symptoms of a worn-out battery are often confused with charging case malfunctions or software failures. Here are the key signs that it is time to change the battery:

• 🔋 Headphones are discharged 1-2 hours instead of the stated 4-6 hours (even after full charge).
• 🔌 One earphone discharges much faster than the other (the difference is more than 30%).
• 🔄 Headphones do not keep the charge off (discharge overnight in the case).
• 🚫 The headphone does not turn on or immediately switches off after connecting to the phone.
• 📉 Mi Fit or Xiaomi Wear app shows 0% charge immediately after extraction from case.

If at least 2-3 a list of items about you, the probability 90% But before you replace it, run a charge case diagnosis:

1. Try charging the case with another cable and power supply.
2. Clean the contacts of the case and headphones with a cotton swab dipped in alcohol.
3. Check if the headphones are charged in the case (the indicator should flash or burn constantly).

If the case is serviceable, and the headphones still do not hold the charge - it is time to prepare for a battery replacement.

2 What tools and materials will be needed

To replace the battery in Xiaomi headphones, you need a minimum set of tools, most of which can be bought on AliExpress or at radio stores for free. 300-800 Here's the full list:

⚠️ Warning: Do not use metal blades for disassembly - they will scratch the plastic and can close contacts on the board. 0.1-0.2 mm.

Also prepare a new battery. You can buy it.

• 🛒 On AliExpress (search for headphones, for example, "Battery for Xiaomi AirDots Pro 2").
• 🛠️ In radio shops (check the parameters: this is usually the case). 3.7V 40-60mAh).
• 🔧 In service centers (sometimes sell parts for self-repair).

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Before buying a battery, check its dimensions! take a picture of the old battery next to the ruler or compare it to the characteristics in the datachite (look for the headphone model). + "battery specs").

3. Step-by-step instruction: disassembling Xiaomi headphones

Disassembly is the most critical stage, and failure here can damage the speaker, the microphone, or the board, and proceed carefully and without haste.

Step 1. Unplug the back cover.

Xiaomi's headphones are glued around the perimeter to separate the lid.

1. Insert a plastic mediator into the gap between the front and back of the case (start from the spot next to the button).
2. Carefully guide the mediator around, separating the glue. Don't force it, the plastic is fragile!
3. If the cover does not lend itself, slightly heat the headphone with a hairdryer (temperature not higher than 60).°C) to soften the glue.

Step 2. Remove the charge

After removing the cover, you will see:

• 🔊 Dynamic (round element with grid).
• 📱 Board with chips and contacts.
• 🔋 Battery (rectangular element with wires).

Carefully unplug the speaker plume (if you have one) and remove the board. In some models (Redmi Buds 3 Pro), the board is mounted on the latches - put them in the mediator.

Step 3. Unfurnish the old battery

The battery is soldered to the board with two wires: + (Red, and -- to take it off:

1. Put flux on the contacts.
2. Heat each contact with a soldering iron. 2-3 seconds and remove soldering with a suction or a squirt.
3. Carefully separate the battery with tweezers. Don't pull the wires - they can come off!

Check the polarity (+ and -) on board and battery|Clear the contacts from the old solder|Apply flux to new contacts|Make sure the new battery is fit for size.-->

Installation of a new battery: soldering and assembly

Now you have to solder a new battery and assemble the earpiece, and this is a step that requires precision -- a mistake in polarity or a bad soldering can make the earpiece go down.

Step 1. Sell a new battery

Follow this sequence:

1. Check the polarity on the board (usually) + marked with red or the letter P, - - black or N).
2. Apply battery wires to the contacts and fix them with tweezers.
3. Apply the flux and solder first - then + (So less risk of short circuit).
4. Check the soldering for strength - slightly pull the wires.

Step 2. Secure the battery inside the case

Use bilateral scotch or glue B-7000, Don't overdo it with glue, it doesn't have to get on the board or the speaker.

Step 3. Get the earpiece together.

Reverse assembly procedure:

1. Put the charge in place and connect the speaker plume (if there was one).
2. Make sure that all buttons and microphones are not pressed.
3. Close the lid and press it on. 10-15 seconds for the glue to grab.

⚠️ Note: If the headphone does not turn on after assembly, check:

• 🔌 Quality of soldering (are there cold contacts).
• 🔊 Connecting the speaker (possibly the plume has departed).
• 📱 Contacts between the board and buttons (they could have moved).

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After replacing the battery, the headphones need to be completely discharged and charged. 2-3 This calibrates the battery controller and extends its lifespan.

5. Common Mistakes and How to Avoid Them

Even experienced wizards sometimes make mistakes when replacing the battery in Xiaomi headphones, and here are the most common mistakes and ways to prevent them:

Critical error: ignoring the test after assembly! Before final gluing of the case, be sure to check the headphone for health: connect to the phone, listen to the sound, check the microphone and buttons. If something does not work, disassemble the earphone again, without waiting for the glue to dry out.

Another common problem is the uneven charge of the headphones after the battery is replaced.

• 🔋 Different battery capacity in the left and right headphone (buy batteries from the same batch).
• 📉 Uncalibrated charge controller (solved by full discharge-charge cycle).
• 🔌 Poor contact in the case (clean contacts with alcohol).

6.Where to buy a Xiaomi headphone battery and how much it costs

The price of a new Xiaomi headphone battery depends on the model and the place of purchase, on average, it ranges from 150 to 500 rubles per battery.

• 🛒 AliExpress is the biggest choice, but a long wait (2-4 Look for sellers with higher ratings 98% Examples of queries: "Xiaomi AirDots Pro" 2 battery 40mAh" "Redmi Buds 3 Pro replacement battery"
• 🏬 Local radio stores are faster but more expensive. Check on the phone if there are batteries for your model. 3.7V 40-60mAh wired.
• 🔧 Service centers -- some workshops sell self-repair parts, higher price, but guaranteed compatibility.

Selection advice:

• 📏 Check the size of the old battery (length/width/thickness) and allowable deviation of no more than 0.5 mm.
• 🔋 The capacity must be the same as the original (usually) 40-60mAh). Large capacity is not always better - it may not fit into the case.
• 🔌 Check the length of the wires – they should reach the contacts on the board without tension.

⚠️ Warning: Avoid "no-name" batteries without labeling! Cheap batteries without protection can swell or explode when charged. ATL Samsung (which Xiaomi uses in its original headphones).

7. Alternative ways to extend the life of the battery

If you don’t want to replace the battery, try these methods to restore its capacity a little:

• 🔄 Calibrate the charge controller: Completely discharge the headphones (before switching off). Charge them in the case to 100% and hold on charging for another 1 hour. Repeat the cycle 3 times.

Clearing contacts:

Partially charged storage:

40-60%

Avoid overheating:

These measures can extend the life of the battery. 3-6 months, but if it has already deteriorated greatly (swelled, does not hold the charge at all), replacement is the only way out.

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If one headphone discharges faster than another, try to change them in the case to the next. 1-2 Sometimes it helps to level the charge by using the backset earphone more intensively.

8. Frequently Asked Questions (FAQ)