Replacement of the battery in the button Xiaomi: instructions for all models

Xiaomi buttons and remotes are an integral part of the smart home ecosystem, but even such compact devices require periodic maintenance. The most common problem that users face is the discharge of the battery. Unlike smartphones, where low charge is displayed on the screen, the Mi Home, Aqara or Yeelight buttons simply stop responding to presses, leaving the owner wondering whether the device broke, or it is time to change the battery.

In this article, we will learn how to replace the battery in any Xiaomi button without damaging the case and without losing communication with the smart home. CR2032 before CR2450), How to properly open the case without special tools, and what to do if the button does not work after replacing. We will also give tips on choosing high-quality batteries and tell you how to extend their lifespan by 2 times.

Important: the replacement procedure takes no more than 5 minutes, but disassembly errors can lead to loss of warranty or failure of the device.If you have never dealt with miniature electronics, carefully follow the instructions and warnings in the article.

What Xiaomi buttons require a battery replacement?

Xiaomi’s ecosystem includes dozens of buttons and remotes, but not all of them are equipped with removable batteries. Below is a list of the most popular devices that need to change the battery periodically:

• 🔘 Xiaomi Mi Smart Home Wireless Switch (round/square) CR2032
• 🔘 Aqara Wireless Mini Switch (one)-/two-button) — CR2032 or CR2450 (depending on the version)
• 🔘 Yeelight Wireless Switch — CR2032, Compatible with Yeelight lamps
• 📺 Xiaomi Mi TV Remote (remote for TVs) — AAA (2 pcs) or CR2026 (compact)
• 🔊 Xiaomi Mi Bluetooth Speaker Remote — CR2026

Please note: some devices (such as the Xiaomi Mi Smart Button or Aqara Cube) are built-in battery and are not designed to replace the battery on their own. If your model is not mentioned in the list, check the specifications on the official website or in the Mi Home app.

The battery life depends on the intensity of use, for example, in Aqara buttons, which are used to control light 10-20 times a day, the element is used. CR2032 It lasts 1-2 years, but if the device is idle for months, the battery can run out of battery life in 6-12 months.

How to know if the battery is dead: 5 signs

Xiaomi buttons are rarely equipped with charge indicators, so the discharge of the battery has to be determined by indirect signs.

1. The device is unresponsive, the most obvious sign. Before you change the battery, check if the button has untied from the hub in the Mi Home app.
2. Delayed operation – if before the light was turned on instantly, and now you have to press 2-3 times, most likely, the battery voltage has dropped.
3. Accidental positives - at low charge contacts can close spontaneously, including / turning off devices.
4. In-app notification – Some models (such as Aqara) send a push notification about a low charge.
5. The button only works near the hub – a weak signal from a discharged battery does not reach the gateway at a long distance.

If you see any of these signs, it's time to replace the power, but first make sure that the problem isn't with the device or the hub.

1. Reboot the Xiaomi gateway (turn off power for 30 seconds).
2. Check if the metal case or furniture is blocking the signal between the button and the hub.
3. Make sure that the Mi Home button is not manually disabled (Devices) → [button] → Settings → Status).

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If the button stopped working after updating the hub firmware, try resetting it to factory settings. To do this, press and hold the button for 10-15 seconds until the indicator flashes (if any).

Step-by-step: how to change the battery in the button Xiaomi

The process of replacing the battery is the same for most models, but there are nuances depending on the type of case. Below is a universal instruction, taking into account the features of popular devices.

What you need:

• 🔧 Plastic spatula (mediator) or thin screwdriver with a flat sting.
• 🔋 New battery (type) CR2032, CR2450 or CR2026 — Look at the markings on the old one).
• 🧲 Magnet (optional, to remove batteries from hard-to-reach compartments).
• 📸 Smartphone (to photograph the location of contacts).

Step 1: Opening the hull

Most Xiaomi buttons have a two-part body, which is held together by latches, to open it:

1. Place the button on a flat surface with the front side down.
2. Insert the plastic blade into the gap between the top and bottom of the body (usually it is located next to the mounting hole).
3. Carefully slap the lid as you move around the perimeter. Don't use excessive force, the latches are fragile!

⚠️ Warning: If the body doesn't respond, don't try to split it with a hammer or a knife. In some models (such as the Aqara Wireless Mini Switch), the lid is fixed by a screw under the cross screwdriver. Check the case for hidden attachments.

Step 2: Remove the old battery

After the autopsy, you'll see a battery compartment, and depending on the model, it can:

• Lie free (for example, in Xiaomi Mi Smart Home Wireless Switch).
• Be fixed by a metal holder (in Aqara).
• soldered to contacts (found in older versions of remotes).

If the battery is not soldered, gently tuck it in with a spatula or magnet. Remember the polarity (usually the case has markings «+» If the contacts are oxidized, wipe them with a cotton swab soaked in alcohol.

Step 3: Installation of a new battery

Before installing the new battery:

Take a picture of the old battery.|Check the type markings (CR2032, CR2450 etc.)|Clean the contacts from oxidation|Make sure the polarity matches the old battery.-->

Set a new battery with polarity, the battery should lie tight, without backlash, if it hangs, put a thin layer of insulating tape under it (but don't overdo it, it can disrupt contact).

Step 4: Assembly of the body

Carefully combine the two halves of the body and press them until the snap of the latch. Don't force the button, it can damage the micro-switch.

1. Press the button and a click should be heard.
2. Make sure that the Mi Home app displays the status of the device (online/offline).
3. Test the basic function (e.g. turning on the lights).

⚠️ Note: If the button does not work after the battery is replaced, check:

• Correct installation of the battery (inverted battery – a frequent mistake!).
• Integrity of contacts (possibly they bent during assembly).
• Communication with the hub (sometimes after the battery is replaced, you need to reconnect the device to the Mi Home).

Which battery to choose: an overview of types and brands

The quality of the battery not only determines the life of the button, but also the stability of its operation. Cheap batteries can leak, oxidize contacts or discharge in a few months. Below is a comparison table of popular types and recommendations for choice.

For Xiaomi buttons, it is better to choose batteries of proven brands:

• 🔋 Panasonic – reliable, long service life, minimum self-discharge.
• 🔋 Duracell – resistant to temperature changes (relevant for buttons on the street).
• 🔋 Energizer – Good price/quality balance, rarely leaks.
• 🔋 Maxell - budget option, but the quality is not inferior to the leaders.

Avoid no-name batteries from supermarkets, which are often undercapacity and can damage the contacts of the device. It is especially dangerous to use batteries with an expired shelf life (usually 5-7 years from the date of manufacture) - they are prone to electrolyte leakage.

Frequent Mistakes and How to Avoid Them

Even a simple procedure like replacing a battery can be a problem, if you don't take into account some nuances, and here are some of the most common mistakes and ways to prevent them:

Damage to the latches of the shell

Many users try to open the case with a knife or a screwdriver, causing the plastic fixtures to break down.

• Use a plastic spatula or a mediator.
• Heat the body with a hair dryer (temperature 50–60)°C) within 1-2 minutes - the plastic will become softer.
• Do not insert the tool deeper than 2-3 mm.

2. Wrong polarity

Mixed up «+» and the -- is the most common reason for a button to fail after it's replaced:

• Take a picture of the old battery before it is removed.
• Note the marking on the body (usually «+» dotted).
• If there is no marking, check with a multimeter: the red probe should show a positive voltage on the top of the battery.

Contact oxidation

Over time, the contacts in the battery compartment may become coated with plaque, which leads to a poor connection, to clean them up.

• Use a cotton swab dipped in isopropyl alcohol or vinegar.
• For strong oxidation, an eraser is suitable (sweep them contacts).
• Do not use sandpaper – it can damage the coating.

4. Loss of communication with the hub

Sometimes, after the battery is replaced, the button stops showing up in Mi Home, because it resets, to reconnect.

1. Remove the device from the application (Devices) → [button] → Settings → Delete).
2. Press and hold the button for 5-10 seconds until the indicator blinks (if any).
3. Add the device again through Add the device → Button.

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If the button is not determined after several attempts, check if the region has changed in the Mi Home settings. Some devices (for example, Aqara) require the selection of the China mainland server for correct operation.

How to extend the life of the battery in the button Xiaomi?

The average life of a Xiaomi battery is 1-2 years, but if used correctly, it can be increased by 1.5-2 times.

1. Optimize the frequency of use

Every push of a button consumes the battery, so you can cut down on the number of clicks.

• 🔄 Set up automation in Mi Home. For example, instead of manually turning on the lights, use a time trigger or motion sensor.
• 📱 Control devices via a voice assistant (Alice, Google Assistant) or a widget on your smartphone.
• 🔌 Use double/triple taps for different scenarios (e.g. one tap is light, two taps are socket).

2. Store spare batteries correctly

If you buy batteries in reserve, observe the storage conditions:

• 🌡️ Temperature: from +10°C +25°C (do not store in the refrigerator!).
• 💧 Humidity: not higher than 60% (excess moisture leads to corrosion).
• ☀️ Avoid direct sunlight.
• 📦 Store in the original packaging or sealed container.

3. Check the battery voltage

Don't wait until the button stops working. Regularly (every 3-6 months) check the battery voltage with a multimeter:

• 🔋 3.0-2.8 V - battery normal.
• 🔋 2.7-2.5 B – Time to prepare for replacement.
• 🔋 Below 2.5V - urgent replacement, possible failures in operation.

⚠️ Note: Do not use batteries with voltages below 2.7V – this can lead to unstable button operation and even damage to contacts due to leakage of the electrolyte.

4.Use low self-discharge batteries

Conventional lithium batteries lose up to 10% of their charge per year even without use. For buttons that are rarely used (such as emergency switches), choose models marked "Low Self-Discharge"** (such as Panasonic Evolta or Eneloop).

What if the button doesn’t work after the battery is replaced?

If you've replaced the power, but the button is still unresponsive, don't panic. 90% of the time, the problem is solved without going to the service.

Check the polarity of the battery.|Clean the contacts from oxidation|Make sure the battery fits tightly to the contacts.|Reboot the Xiaomi Gateway|Check the link of the button to the hub in Mi Home-->

1.The battery is not in contact with the board

Sometimes the battery may seem to be installed correctly, but it's not really pressed to the contacts.

• Carefully press the battery with your finger and press the button. If the device works, the backlash is the problem.
• Put a thin layer of foil or tape under the battery for better contact.

2. Damaged contacts

If the contacts are bent or oxidized, the battery will not be able to transmit current.

• 🔧 The bent contacts can be carefully straightened with tweezers.
• 🧪 Oxidized – cleaned with alcohol or a special contact liquid (for example, Kontakt 60).

3. Reset button settings

Some models (such as the Aqara Wireless Mini Switch) reset when the battery is completely drained.

1. Hold the button for 10-15 seconds until the indicator flashes (if any).
2. In the Mi Home app, select Add Device → Button.
3. Follow the instructions on the screen (scanning may be required) QR-hull-code).

4.Hub or network problems

If the button is running (hearing a click), but the command does not reach the execution device, the problem may be in the hub or the Zigbee network:

• 🔄 Reboot the Xiaomi gateway (turn off power for 30 seconds).
• 📶 Check the distance between the button and the hub (maximum 10-15 meters without obstacles).
• 🛠️ Update the Hub Firmware in Mi Home (Profile) → Settings → Firmware update).

If none of these methods worked, the problem may be the button itself (the board is damaged or the micro-switch is broken), in which case contact the Xiaomi service center or consider buying a new device - repairs can cost more.

FAQ: Frequent questions about replacing the battery in the buttons Xiaomi