Replace the battery in the thermometer Xiaomi: disassemble, change, check

Xiaomi smart thermometers are some of the most popular health gadgets due to their accuracy, compactness and integration with the Mi Home ecosystem. But even such advanced devices require periodic maintenance: over time, the battery goes down and the thermometer begins to show incorrect data or refuses to turn on at all. If your Xiaomi Mi Thermometer, Mi Bunny or another model stops syncing with your smartphone, constantly switches off or gives a Low Battery error, it’s time to change the power supply.

In this article, you will find step-by-step instructions with photos, videos (for key points), a battery compatibility table and answers to frequent questions. We will take a look at all Xiaomi thermometer models, including rare versions, and tell you how to avoid typical replacement errors, such as why the device may not turn on after installing a new battery, or how to reset correctly if the the thermometer “hangs”.

Spoiler: The replacement process is easier than it sounds, but there are two critical points that are not covered in the standard instructions: the first is the type of battery (not all pills» CR2032 They're good for Xiaomi, and the second one is the sequence of the body assembly so that you don't damage the contacts.

What Xiaomi Thermometers Need Battery Replacement?

Not all Xiaomi smart thermometers are powered by interchangeable batteries. USB-Recharging, like the Xiaomi Mi Smart Band 6 with a temperature sensor, doesn't require manual battery replacement, but classic self-powered thermometers will have to be serviced on their own:

• 📱 Xiaomi Mi Thermometer (classic version, round shape)
• 🐰 Xiaomi Mi Bunny Thermometer (in the shape of a rabbit, for children)
• 💊 Xiaomi Mi Smart Thermometer 2 (rectangular case, Bluetooth 5.0)
• 🩺 Xiaomi Mijia iHealth Thermometer (joint project with iHealth)
• 🔋 Xiaomi Mi Body Temperature Thermometer (for body temperature measurement)

If your model is not included in the list, check its specs in the Mi Home app or on the box. Devices with built-in battery (for example, Xiaomi Mi Band 7 Pro) are not disassemblable to replace the battery - they need to be charged via cable.

Note that some Xiaomi thermometers use non-standard batteries, such as Mi Bunny. CR1632, not the usual CR2032. If you mix up the types, the device either won't turn on or the battery will run out quickly because of a mismatch in voltage.

What battery to buy for a Xiaomi thermometer?

The choice of the battery is the most important step, and even if you take the case apart, but you install the wrong battery, the thermometer can fail. Here are the exact compatibility data for each model:

Where can I buy the right battery?

• 🛒 Offline stores: "Fix Price", "Magnet", "Crossroads" (departments with batteries).
• 🌍 Online: Wildberries, Ozon, AliExpress (search by code, for example, «CR1632»).
• 🔧 Service centers: sometimes sell original items for Xiaomi.

⚠️ Warning: Do not use batteries with an expired shelf life (indicated on the package); even a "fresh"-looking battery can be discharged if it has been in storage for more than 2-3 years!

If you're not sure what type of battery you're looking at, look at the old one, it's always marked, CR2032 signifier:

• C - chemical composition (lithium)
• R = shape (round)
• 2032 - diameter 20 mm, thickness 3.2 mm

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Before buying, measure the diameter and thickness of an old battery with a rod or ruler – sometimes manufacturers use non-standard dimensions.

Preparing for replacement: security tools and measures

To disassemble the Xiaomi thermometer and change the battery, you will need:

• 🔧 Plastic blade or mediator (for neat opening of the body).
• 🧲 Magnetic screwdriver (if there are screws in the thermometer).
• 🔋 New battery (of the correct type, see the table above).
• 📸 Smartphone (to photograph the location of contacts).
• 🧴 Alcohol wipes (for cleaning contacts).

Important: don't use metal tools to open the case! They can scratch plastic or close contacts. If you don't have a plastic blade at hand, take an old bank card or even a nail (if the case is not too tight).

Is the battery suitable in type and size?|Are there any autopsy tools at hand?|Is the initial position of the contacts photographed?|Whether the contacts are cleared of oxidation (if necessary)|Is the thermometer off from Mi Home (to avoid failures)-->

If your thermometer is synced to the Mi Home app, turn it off before you change the battery.

1. Open Mi Home → Choose your thermometer.
2. Go to the Device Settings → Remove the device.
3. Confirm the deletion (the data will be stored in the history of the application).

This will prevent conflicts when reconnecting after battery replacement.

⚠️ Warning: Don't disassemble the Xiaomi thermometer near moisture sources or in a dusty room. Getting dirt or water on a board can make the device malfunction.

Step-by-step: how to disassemble the thermometer and change the battery

The replacement process varies depending on the model, and below are detailed instructions for Xiaomi’s most popular thermometers.

1. Xiaomi Mi Thermometer (round)

This model is disassembled without screws - the body is kept on latches.

1. Insert a plastic blade into the gap between the upper and lower parts of the body (near the display).
2. Carefully slap the lid as you move around, and you'll hear the characteristic clicks -- these are the snaps.
3. Remove the top and place it with the display upwards (don’t touch the screen panel!).
4. Remove the old battery, it's held in a special socket, and put it in a shoulder blade or a nail.
5. Install a new battery. CR2032 plus up (there is a marking on the body) +).
6. Collect the body, starting with the latch next to the power button. Press until you click.

2. Xiaomi Mi Bunny Thermometer

This rabbit-shaped thermometer is understood differently:

1. Turn the device over and find a small indentation on the “foot” of the rabbit – there is a screw hidden.
2. Spin the screw with a screwdriver (usually) T5 or T6).
3. Separate the body into two halves, starting from the place of attachment of the "ears".
4. Remove the board - battery CR1632 is on the back.
5. Replace the item by observing polarity (plus should look at the board).
6. Collect the body and twist the screw. Make sure the rabbit's ears are symmetrical.

In this model, it's a common mistake to confuse the polarity of the battery. If the thermometer doesn't turn on after assembly, check if it's installed correctly. +.

3. Xiaomi Mi Smart Thermometer 2

This model has screws hidden under stickers:

1. Remove the stickers from the back (they are not glue-free, easily depart).
2. Twisted 2 screws (T4).
3. Put the case on the side of the display, it will open like a book.
4. Battery CR2032 It's in a metallic clasp. Carefully tuck it in.
5. Install a new battery and assemble the body in reverse order.

In Mi Smart Thermometer 2, after the battery is replaced, you may need to reset your settings. To do this, press the on button for 10 seconds until the display blinks.

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In 90% of cases, the thermometer fails after the battery is replaced due to improper polarity or poor contact, and always check whether the battery fits tightly against the terminals.

What if the thermometer is not turned on after replacement?

Situation: You've changed the battery, you've assembled the case, but the Xiaomi thermometer doesn't respond to the power button.

If the thermometer is beeping or gives an error, try updating the firmware through Mi Home:

1. Remove the device from the app.
2. Press the button on the thermometer for 5 seconds until the indicator blinks.
3. Add the device again through Add the device → Thermometer.

If nothing works, check the battery voltage with a multimeter. Even the new battery can be defective (voltage should be 3.0-3.3 V).

⚠️ Warning: Don't try to "resuscitate" a dead battery by heating or deformation! Lithium cells can ignite if damaged. Always use new batteries from proven brands.

How to extend the life of a battery in a Xiaomi thermometer?

The average battery life in Xiaomi thermometers is 1-2 years with regular use, but there are ways to extend this period:

• ⚡ Turn off Bluetooth when you are not using the thermometer. To do this, press the button for 3 seconds - the indicator will go out.
• 📴 Remove the device from Mi Home if you don’t plan to use it for more than a month, which will reduce the frequency of background synchronizations.
• 🌡️ Store it in a dry place. Humidity accelerates the oxidation of contacts, which leads to increased charge consumption.
• 🔄 Use low-discharge batteries (e.g. Duracell Quantum or Energizer Ultimate Lithium).

If the thermometer has been idle for more than a year, remove the battery for storage time. Lithium cells gradually discharge even in the device turned off.

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Periodically (every 3 months) wipe the contacts of the battery and terminal in the thermometer with a cotton swab dipped in alcohol. This will remove oxides and improve conductivity.

Where to repair a Xiaomi thermometer if the replacement doesn’t work?

If the Xiaomi thermometer still doesn't work after the battery is replaced, there may be a problem with the electronics (damaged board, disconnected contacts, firmware failure).

• 🛠️ Xiaomi official service: find the nearest center on the site mi.com/ru/service. Warranty repairs are possible if the device is younger 12 months.
• 🔧 Unofficial workshops: search for “Xiaomi electronics repair” on Yandex.Maps. The average cost of diagnosis is 500-1000 ₽.

Cost of repair:

• Replacement of battery contacts – 300-600 ₽.
• Flashing the board - 800-1500 ₽.
• Display replacement: 1000–2000 ₽ (cracked).

If the thermometer is older than 3 years, repairs may be unprofitable - it is cheaper to buy a new one. Current models (2023-2026) cost from 1500 ₽ Official Xiaomi stores.

FAQ: Frequent questions about battery replacement in Xiaomi thermometers