What battery is in the thermometer Xiaomi: types, replacement and tips for operation

Xiaomi thermometers are some of the most popular smart health gadgets that combine precision, compactness and integration with the Mi Home ecosystem. But even such a simple device requires attention to detail, especially when it comes to power. The battery in the thermometer is the element that affects not only the operation of the device, but also the accuracy of measurements. In this article, we will discuss what types of batteries are used in different models of Xiaomi thermometers, how to replace them and what to do if the device stops turning on after replacement.

Many users face confusion: some models are standard “pills» CR2032, in others, more rare LR44 or AG13. And some thermometers (for example, Xiaomi Mi Smart Thermometer 2) are generally powered by an integrated battery, we will help you figure out what type of battery your device needs, and give practical tips on choosing analogues and extending the life of your device.

It is important to understand that the wrong choice of battery can lead not only to rapid discharge, but also to failures in the operation of sensors.°C. Therefore, the choice of food should be approached responsibly – especially if the thermometer is used to monitor the health of children or the elderly.

What Xiaomi Thermometers Are and What Batteries Are Used

Xiaomi’s thermometer range includes several popular models, differing not only in design, but also in the type of power supply. Below is a table with the current devices and their batteries:

Note that dual-battery models (such as the Mijia Bluetooth Thermometer) are important to install the same type and degree of charge, and the difference in voltage between batteries can cause the sensor to malfunction or even damage to the board.

If you are not sure about your thermometer model, check its name on the box or in the Mi app. Home/Mi Also, the type of battery is usually indicated on the back of the device next to the compartment for the battery.

How to replace the battery in the thermometer Xiaomi: step-by-step instructions

Replacing the battery in the Xiaomi thermometer is a simple procedure, but it requires care. Here is a universal guide for most models (except the Mi Smart Thermometer 2 with built-in battery):

1. Turn off the thermometer (if there is a power button) or wait until it stops responding to presses, which will prevent short circuits when the battery is removed.
2. Find a battery compartment -- usually on the back side and covered with a lid -- and in some models, like the Mijia Infant Thermometer, the lid is locked with a latch, in others, with a screw.
3. Carefully remove the old battery using a plastic shoulder blade or nail. Do not use metal objects - they can damage the contacts.
4. Install a new battery while observing polarity (+ and − For models with two batteries, usually marked on the body (LR44) install them at the same time.
5. Close the lid of the compartment and check the thermometer. If the device does not turn on, try resetting (usually holding the power button for 10-15 seconds).

If the thermometer shows incorrect values after replacement (for example, temperature 30-32)°C in the room, this could mean:

• 🔋 Insufficient contact – check if the battery fits tightly.
• 📉 Battery discharged – even a new pill can be defective.
• 🔧 Calibration Failure – Try reconnecting the thermometer to the Mi Home app.

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If the Xiaomi thermometer doesn’t sync with your phone after you replace the battery, remove it from the Mi Home app and add it again.

Which battery to choose: original vs analogues

The manufacturer recommends using original batteries from Xiaomi or proven brands (for example, Duracell, Energizer, Panasonic).However, there are cheap analogues on the market that can save both budget and damage the device.

• 🔋 The voltage must be exactly the same as the original (for example, 3V for CR2032).
• ⚖️ Capacity for CR2032 optimally 220-240 mAh, for LR44 — 150-200 mAh.
• 📅 Expiration date – batteries older than 2 years can be partially discharged.
• 🛡️ Counterfeit protection – buy from trusted stores (e.g. AliExpress with seller rating 98%+).

Critical information: Type batteries LR44 and AG13 They are the same size but have different chemical content. LR44 — alkaline (1.5V), AG13 — silver-zinc (1.55V). Xiaomi Thermometers are preferred LR44, They hold the charge longer with frequent measurements.

Among the analogues, they have proven themselves well:

• 🔹 Maxell CR2032 — stable voltage, long service life.
• 🔹 GP LR44 — budgetary option with good capacity.
• 🔹 Varta AG13 — It is suitable for children's thermometers, but requires more frequent replacement.

⚠️ Note: Do not use rechargeable batteries (e.g., rechargeable batteries, ML2032) Xiaomi thermometers! They have a lower voltage (2.4V instead 3V), which leads to sensor failures and distortion of readings.

Frequent problems after battery replacement and their solutions

Even with the right battery replacement, users sometimes experience problems, and consider typical situations and ways to fix them:

If the thermometer after the battery replacement shows deliberately incorrect values (for example, 25)°C when measured under the arm, this may indicate:

• 🔌 Bad contact – check if the metallic “tendles” in the compartment are bent.
• 📱 Firmware failure – update the thermometer software via Mi Home.
• 🔍 Sensor damage – in this case, repair or replacement of the device will be required.

How to extend the battery life in the thermometer Xiaomi

The average battery life in the Xiaomi thermometer is from 6 months to 2 years, but it can be increased by following simple rules:

1. Store the thermometer in a dry place – humidity accelerates the discharge of batteries, especially alkaline ones (LR44).
2. Turn off the thermometer after use (if there is a power button) Many models remain in "sleep" mode, but consume energy.
3. Avoid extreme temperatures - do not leave the thermometer in the sun or freezer. Optimal storage range: 10-30°C.
4. Clean contacts regularly – oxidation increases resistance and shortens battery life.

For Bluetooth models (such as Mijia Bluetooth Thermometer) additional tips are:

• 📴 Turn off sync if you do not use the application – a constant connection consumes charge.
• 🔄 Update your firmware – new versions often optimize power consumption.

⚠️ Warning: If the thermometer has not been used for a long time (more than 3 months), remove the battery from it. Even in the "sleep" mode, a slow discharge occurs, and over time, an electrolyte leak may occur, which will damage the board.

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The most effective way to save battery power is to turn off Bluetooth synchronization in the thermometer settings (if it is not needed all the time).

Where to buy a battery for the thermometer Xiaomi: proven options

Xiaomi thermometer batteries are sold in many places, but not all sources are equally reliable.

• 🏬 Offline shops: 🔹 Eldorado, M. Video – there are branded Xiaomi batteries. 🔹 Ashan, Pyaterochka - budget analogues (Space, Photon). 🔹 Pharmacies - often sold LR44/AG13 medical-device.
• 🌍 Online: 🔹 AliExpress – cheaper, but check reviews (seller rating) 97%+). 🔹 Wildberries, Ozon – Quick Delivery, Original Duracell/Energizer. 🔹 Xiaomi’s official website is a quality guarantee, but the price is higher.

The cost of batteries varies:

• 💰 CR2032 — 30 to 150 rubles (original Xiaomi) ~ 200 rubles.).
• 💰 LR44/AG13 — from 10 before 50 pound-a-piece.

When buying on AliExpress, pay attention to:

• 📦 Packaging – Original batteries have holographic stickers.
• ⭐ Reviews – look for comments with photos (fakes often give off low weight).
• 📏 Size - some Chinese counterparts can be thicker by 0.1-0.2 mm, which is why they are not included in the compartment.

What to do if Xiaomi thermometer doesn’t work after replacing the battery

If the thermometer doesn't show signs of life after you install the new battery, don't rush to throw it away.

1. Check the polarity – even experienced users sometimes set the battery upside down.
2. Try another battery – it may be that the new one was discharged (especially if you bought it with a canopy).
3. Clear the contacts -- oxidation or dirt can block the current. Use a cotton swab and alcohol.
4. Reset the settings – hold the power button for 10-15 seconds (for models with a button).
5. Check the integrity of the spring contact - if it is bent, gently bend it back with tweezers.

If the thermometer is turned on but shows incorrect values, the reasons may be as follows:

• 🔋 Insufficient voltage – even if the battery is new, its charge may be below nominal.
• 📡 Interference from other devices – Bluetooth thermometers can crash near microwaves or routers.
• 🔧 Software glitch – try reconnecting the thermometer to the Mi Home app.

⚠️ Warning: If after all the manipulations the thermometer still does not work, do not disassemble it yourself - this can damage the sensor).

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In 90% of cases, the “defaulting” thermometer after replacing the battery is restored after cleaning the contacts or resetting the settings.

FAQ: Frequent questions about batteries in Xiaomi thermometers