Replacement of the battery in the thermometer Xiaomi: a complete guide with photos and videos

Xiaomi thermometers are some of the most popular smart home gadgets, but even they require periodic maintenance. The most common problem users face is battery discharge. Unlike smartphones, where the battery is built in, most Mi, Mijia or Cleverly thermometers use removable batteries. However, not everyone knows how to replace them correctly without damaging the device.

In this article, we will discuss the battery replacement process for all current Xiaomi thermometer models, including infrared, contactless and classic electronics. You will learn which batteries are suitable for a particular model, how to safely open the case, and what to do if the thermometer does not turn on after replacing, and we will also give tips on extending the life of the batteries and tell you about the typical mistakes that users make.

Important: instructions may vary slightly depending on the year of release of the device. If your thermometer is released before 2020, check the section with the comparison table of models - it shows the design features of the older versions.

What Xiaomi Thermometers Need Battery Replacement?

Not all Xiaomi thermometers have removable batteries, such as the ones with the USB-Mi Smart Thermometer 2 or the Xiaomi Mi Bunny Thermometer don't need to be manually replaced:

• 🔋 Xiaomi Mijia Bluetooth Thermometer (iHealth model) – uses a battery CR2032.
• 🌡️ Xiaomi Cleverly Smart Thermometer – works from the AAA (pinkie batteries.
• 📱 Xiaomi Mi Smart Thermometer E – Removable element CR2026 (partisan — CR2032).
• 👶 Xiaomi Mi Bunny Thermometer (contactless) CR1632.

To pinpoint your thermometer model, look at the back of the case -- there should be a name sticker. If the labels are erased, check in the Mi Home app: go to Devices. → [thermometer] → Settings → Information.

Battery life depends on the intensity of use, for example, in contactless thermometers, the power cell dies faster because of the energy-consuming infrared sensor. In classical electronic models, the battery can last up to 2-3 years with monthly use.

Which battery to replace?

An error in the choice of a battery can lead to malfunctioning of the thermometer or even its failure. Below is the table of compatibility of batteries for popular Xiaomi models:

When buying a battery, pay attention to the following points:

• 🔍 Brand: Preference is given to proven manufacturers - Duracell, Energizer, Panasonic or Maxell. Cheap Chinese counterparts can leak and damage contacts.
• 📅 Expiration date: Batteries have a limited shelf life.Do not take items released more than 3 years ago.
• 🔋 Type of chemistry: For thermometers, only lithium is suitable (CR...) oralkaline (LR...) The salt (R....) goes down quickly.

⚠️ Warning: Never use rechargeable batteries (ML Instead of disposable batteries, the voltage (1.2 V) is lower than the standard 1.5 V or 3 V, which will cause the thermometer to malfunction.

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Before you buy a battery, take a picture of the old one or write down its markings. CR2026 and CR2032 — They are almost identical, but have different capacity.

Step-by-step instructions for replacing the battery

The process of replacing the battery depends on the model of the thermometer, and below we will discuss the universal algorithm, as well as the features for specific devices.

Preparation of tools

You'll need:

• 🔧 Plastic blade or mediator (for models with hidden fastening).
• 🔍 Lupa (for small batteries of the type) CR1632).
• 🧴 Alcohol wipes (for cleaning contacts).
• 📦 New battery (see table above).

2. Opening of the hull

Most Xiaomi thermometers have one of three types of attachment:

• 🔄 Latches (for example, in Mijia Bluetooth Thermometer) – gently tuck the lid with a plastic blade on the side.
• 🔩 Screwdrivers (rarely, for example, in some Cleverly Smart games) - use a screwdriver PH00.
• 🔗 Magnetic fastening (in new models) – pull the lid up with force.

For models with latches, be careful: under excessive pressure, plastic can crack. If the lid does not respond, try to heat the body with a hairdryer (temperature not higher than 50).°C) - plastic will become softer.

3. Removal and replacement of the battery

After the opening of the hull:

1. Carefully remove the old battery with a nail or a plastic spatula. Don't use metal objects - they can close contacts!
2. Wipe the contacts in the compartment with an alcohol napkin. Oxidation or dirt can impair the connection.
3. Install a new battery while observing polarity (+ and −). In most thermometers Xiaomi contacts signed.

For models with two batteries (Cleverly Smart), make sure they are installed in parallel, not in series. Failure to follow this rule can lead to short circuit.

4.Assembly and inspect

Close the lid of the case, make sure all latches are in place, turn on the thermometer and check it:

• 📱 Connect to the Mi Home app (if supported).
• 🌡️ Compare the readings with another thermometer (acceptable error — ±0.1°C).
• 🔋 Make sure the battery indicator in the app shows 100%.

⚠️ Warning: If the thermometer does not turn on after the battery is replaced, check: Polarity of the battery installation; Integrity of the contacts (possibly oxidized or bent); Condition of the sealing gum (in waterproof models).

Features of battery replacement in popular models

Each model of the Xiaomi thermometer has its own nuances. Let's take a closer look at them.

Xiaomi Mijia Bluetooth Thermometer (iHealth)

This model has hidden latches on the sides of the body, so you can open it.

1. Put the thermometer down with the screen.
2. Carefully press on the upper part of the body with your thumbs - two clicks should be heard.
3. Keep the lid up (do not pull the lid!).

Battery CR2032 It is located under a plastic latch - it needs to be slightly bent.

Xiaomi Cleverly Smart Thermometer

This model has two batteries. AAA, They're in a separate compartment:

• The compartment opens with a shift of the lid down (arrow on the body).
• Batteries are installed plus to spring.
• After the replacement, you need to reconnect to Mi Home (hold the switch on button for 5 seconds).

Xiaomi Mi Bunny (Contactless)

Most difficult model to replace a battery due to its miniature size (CR1632). Advice:

• Use tweezers to retrieve the old battery.
• Do not touch the contacts with your bare hands – static electricity can damage the sensor.
• After replacement, perform calibration: point the thermometer at an object with a known temperature (for example, ice - 0).°C) and hold the button for 3 seconds.

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In contactless thermometers Xiaomi Mi Bunny battery CR1632 Slimming down the standard – don’t try to replace it with CR2032, Even if it fits in diameter, it will damage the contacts.

Common Mistakes and How to Avoid Them

Even with the seemingly simple process, many users make mistakes that cause the thermometer to break, and the most common ones are:

• 🔋 Incorrect type of battery: Installation CR2026 instead CR2032 It will cause a quick discharge. Always check the markings!
• 🔄 Confused polarity: If you flip the battery, the thermometer may not turn on or show incorrect values.
• 💦 In waterproof models (Mi Bunny), remember to check the sealing gum after replacing it.
• 🔧 Pressure too high: When you open the case, the plastic latches can break. Use plastic tools.

Another common problem is resetting after you change the battery. Some models (Cleverly Smart) are fine, but Mijia Bluetooth may have a malfunction. If the thermometer requires you to reset, follow the instructions:

1. Remove the device from the Mi Home.
2. Press and hold the 10 seconds switch (up to double signal).
3. Add the thermometer again through Add the device → Health → Thermometer.

If the thermometer after the battery replacement shows deliberately incorrect values (for example, body temperature 45).°C, probably, has a calibration failure:

• Perform a reset (see above).
• Check the thermometer on three different objects (water with ice, room temperature, body).
• If the problem remains, contact the service (possibly damaged sensor).

How to extend the battery life?

The average battery life in a Xiaomi thermometer is 6 months to 2 years, but you can increase it by following these tips:

• ⏻ Turn off the thermometer after use (if there is a power button). In standby mode, the battery goes down 2-3 times faster.
• 📱 Turn off Bluetooth if you don't sync with Mi Home.
• 🌡️ Keep the thermometer in a dry place. Humidity accelerates the oxidation of contacts, which increases energy consumption.
• 🔋 Remove the battery for prolonged non-use (more than 3 months). Lithium cells discharge even in the device turned off.

For models with AAA-Batteries (Cleverly Smart) can be used by batteries (e.g. Eneloop), but keep in mind:

• The voltage should be 1.5 V (not 1.2 V!).
• Capacity - at least 800 mAh.
• Charge only with an external charger (not in the thermometer!).

If the battery starts to run down quickly, check:

• Contact state (oxidation increases resistance).
• Mi Home Settings – Turn off background synchronization.
• Storage temperature - at below 0°Lithium batteries lose capacity.

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In Xiaomi Bluetooth thermometers, low battery charge can manifest not only by flashing an indicator, but also by the Mi Home app freezing when trying to synchronize.

What if the thermometer doesn’t work after replacement?

If the thermometer does not turn on or does not work correctly after replacing the battery, follow this algorithm:

1. Check the polarity: Turn the battery over and try again.
2. Clean contacts: Use an eraser or alcohol to remove oxidation.
3. Check the battery: Install it in another device (such as a remote).
4. Reset: For Mijia: hold the 10 seconds button. For Cleverly: remove the batteries for 1 minute.

Check the hull.

If the thermometer is turned on but shows an error in connecting to the Mi Home:

• Remove the device from the app.
• Reboot your smartphone.
• Turn on Bluetooth and repeat the pairing.

For models with an infrared sensor (Mi Bunny), the malfunction can occur in the form of:

• Constant flashing of the indicator.
• Indications 0.0°C or --.-°C.
• Impossibility of calibration.

In this case, the problem is most likely the sensor, not the battery. Contact Xiaomi Service Center (addresses can be found on mi.com).

⚠️ Warning: If you notice bloating or a foreign smell when you replace your battery, immediately stop using the thermometer! these are signs of electrolyte leakage that can damage the skin or mucous membranes.Wash your hands with soap and dispose of the battery in a special container.

FAQ: Frequent questions about battery replacement in Xiaomi thermometers