What battery is in the thermometer Xiaomi: type, replacement and useful tips

Xiaomi smart thermometers have long been an integral part of the Mi Home ecosystem, offering accurate temperature and humidity measurements synchronized with a smartphone. However, even such a simple device requires periodic maintenance - first of all, a replacement of the battery. The question "what battery is in the Xiaomi thermometer?" arises for users suddenly: the gadget stops synchronizing, shows incorrect data or completely shuts down. In this article, we will understand what type of battery is used in the popular models of the brand thermometers, how to replace it and what to pay attention to when buying.

It’s important to understand that not all Xiaomi thermometers are equipped with removable batteries. Some models (such as the Xiaomi Mi Temperature and Humidity Monitor 2) have an integrated battery that can’t be replaced on their own. Others, like the Xiaomi Mijia Bluetooth Thermometer E Ink or the Xiaomi ClearGrass Thermometer, are powered by standard pills. We’ll focus on interchangeable devices — they make up the majority of the market.

If your thermometer is no longer responsive to pressing or is not displaying data in the Mi Home app, the first thing you do is check the charge indicator (if you have one), or try reconnecting the device. Often the problem lies in the dead battery. Next, a detailed guide to select and replace.

What Xiaomi thermometer models work on replaceable batteries

Not all Xiaomi smart thermometers have removable batteries, and here is a list of popular models that can be replaced by a battery on their own:

• 🔋 Xiaomi Mijia Bluetooth Thermometer (LYWSD03MMC) — Classical model with e-ink display, works on CR2032.
• 🌡️ Xiaomi ClearGrass Thermometer (LYWSDCGQ/01ZM) — A compact temperature and humidity sensor also uses CR2032.
• 📱 Xiaomi Mi Temperature and Humidity Sensor 2 (LYWSD02) — budget option without display, powered by CR2032.
• 🏠 Xiaomi Aqara Temperature and Humidity Sensor (WSDCGQ11LM) — Compatible with the Aqara ecosystem, battery CR2032.

Note: Models with index LYWSD03MMC and LYWSDCGQ They look similar, but they have different firmware and capabilities, LYWSD03MMC supports the display of data on the screen, and LYWSDCGQ It only sends them to the app, and both versions use the same type of battery.

If your model is not listed, check the documentation or box of the device. Pro or Max thermometers (such as the Xiaomi Mi Thermometer Pro) often come with built-in batteries and are not self-repairable.

Type of battery in the thermometer Xiaomi: CR2032 and its analogues

The vast majority of Xiaomi thermometers with interchangeable batteries use a battery type CR2032. This is a lithium "tablet" with a voltage of 3 V and a capacity of about 220-240 mAh. It belongs to the standard. IEC has the following characteristics:

• 🔄 Diameter: 20 mm.
• ⚖️ Thickness: 3.2 mm.
• ⚡ Voltage: 3V (not to be confused with 1.5V alkaline tablets»!).
• 🔋 Type of chemistry: lithium-manganese dioxide (Li-MnO2).

Important: Xiaomi thermometers DO NOT use alkaline batteries (for example, in thermometers, LR44 or LR2032) — They're 1.5 V and they'll quickly disable the device, and avoid cheap no-name components, which may leak or not provide stable power, which will cause sensors to malfunction.

If original CR2032 not available, it is allowed to use analogues from proven brands:

When buying, pay attention to the date of production: lithium batteries lose capacity over time, even without being used. The best option is cells released no earlier than 1-2 years before purchase.

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Before replacing the battery, take a picture of the location of the contacts in the compartment – this will help to avoid errors when installing a new element, especially if the polarity is not clearly indicated.

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

The process of replacing the battery in Xiaomi thermometers is simple, but requires care.

• 🔧 Plastic blade or mediator (to open the body).
• 🔋 New battery CR2032.
• 🧲 Magnet or tweezers (to remove an old element).
• 📸 Smartphone (to photograph contacts).

Follow the instructions:

1. Turn off the power thermometer. If the device is connected to the Mi Home, temporarily remove it from the network or turn off Bluetooth on your smartphone.
2. Open the case. Most Xiaomi thermometers have latches around the perimeter. Carefully apply the lid with a plastic blade starting at the corner. Don't use metal objects, they can damage the case or the circuit board.
3. Remove the old battery. In some models, the cell is fixed with a metal bracket, it needs to be bent slightly, and if the battery is boiling, put a magnet or tweezers on it.
4. Install a new battery. Keep polarity: plus (+) It should match the marking on the board. Usually, the box of the item also has a pole designation.
5. Close the case. Make sure all the latches are in place. Don't put too much effort into it, fragile plastic can crack.
6. Reconnect the thermometer. Launch the Mi Home app, find the device in the list, and re-sync (you may need to reset by holding the button on the case).

If the thermometer is not switched on after replacement:

• 🔄 Check the polarity of the battery.
• 📶 Make sure that Bluetooth on your smartphone is turned on.
• 🔧 Try resetting the device (hold the Reset button on the board for 10-15 seconds).

Where to buy a battery CR2032 Xiaomi thermometer

Batteries. CR2032 They're sold in most electronics stores, supermarkets and online marketplaces:

• 🏬 Offline shops: 🛒 «M.Video / Eldorado - in the departments of accessories for equipment. 🏠 «Leroy Merlin / OBI – in sections with batteries for remotes. 📱 Salons of communication ("Svyaznoy", "Euroset") - sometimes available.
• 🌍 Online venues: 🛒 Wildberries – a large selection of brands, often with discounts. 📦 Ozon - fast delivery, there are sets of 5-10 pieces. 🔧 AliExpress – cheaper, but longer to wait (suitable for wholesale orders).
• 🏢 Specialty shops: 🔋 «All Tools.ru – for professional batteries with a long service life. 📡 «Chip and Deep – if you need elements with special characteristics (for example, for extreme temperatures).

The average price of a battery CR2032 2026:

• 💰 Brand (Duracell, Energizer): 80-150 ₽.
• 💰 Mid-segment (GP, Maxell): 50–90 ₽.
• 💰 Economy options (no-name): 30–60 ₽ (leakage risk higher!).

Tip: Buy batteries from trusted stores or official dealers. In markets or stalls, you are likely to run into a fake with an understated capacity. Pay attention to the packaging, the original elements have sealed, with a production date and a hologram.

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It is better to buy batteries in sets of 2-5 pieces - it is cheaper than buying one piece, and eliminate the need for urgent search for a replacement in a year or two.

Battery life in Xiaomi thermometer and how to extend it

Average battery life CR2032 Xiaomi thermometers are 1-2 years old, but it depends on several factors:

• 📊 Data rate: If the thermometer syncs to the application every 5 minutes, the battery will die faster than if it is updated every 30 minutes.
• 🌡️ Temperature: Extreme conditions (below) -10°C or higher +50°C) reduce the life of lithium cells.
• 📶 Bluetooth connection quality: If the signal is weak, the device spends more energy on repeated attempts to transmit data.
• 🔋 Cheap batteries can run out in 6 to 8 months, while Duracell or Energizer can last up to 24 months.

To extend the life of the battery, follow these guidelines:

In the Mi Home application, you can configure the data update interval:

1. Open the app and select your thermometer.
2. Go to the Device Settings → Frequency of update.
3. Set the value of 30 minutes or 1 hour (instead of the standard 5 minutes).

This will reduce the load on the battery without significantly losing the accuracy of the measurements, for example, to monitor the microclimate in the room, you need to update every half an hour.

⚠️ Note: If the thermometer is used to monitor temperature in an aquarium or incubator where accuracy is critical, do not increase the refresh interval – this may lead to missing important changes.

Frequent Battery Replacement Mistakes and How to Avoid Them

Even a simple procedure like replacing a battery can be a problem if you make mistakes, and here are the most common ones:

• ⚡ Wrong polarity. If you confuse it. + and −, The thermometer will not turn on, and in some cases it may damage the board.Always check the labeling on the case or the photo taken before the old battery is removed.
• 🔧 Contact damage: If you take the element out rough, you can bend the metallic tendrils that hold the battery, and if the contact is weakened, the device will not work smoothly.
• 🧲 Some users try to extract the battery with a magnet, but too strong a field can damage the thermometer sensors (especially in models with a compass or gyroscope).
• 💧 Moisture ingestion: If the replacement occurs in high humidity conditions (e.g. in the bathroom), the condensate may settle on the board and cause corrosion.
• 🔋 Install a discharged battery, even a new battery can be discharged if it has been in storage for several years).

If the thermometer does not work after the replacement:

1. Check if the contacts are oxidized (clean them with alcohol if necessary).
2. Make sure the battery fits tightly to the contacts (sometimes helps to put a piece of foil).
3. Try to “wake up” the device by clicking on the reset button (if any).

⚠️ Note: If the thermometer after battery replacement shows incorrect data (for example, temperature) -50°C or +100°C), this may indicate damage to the sensor, in which case the device requires repair or replacement.

Alternative ways to power the Xiaomi thermometer

In some cases, replace the battery. CR2032 It's hard, like if it's not available or if the thermometer's body is damaged:

• 🔌 External nutrition through USB. Some craftsmen connect the thermometer to a 3.3V source (such as from an Arduino or a phone charger) through soldered contacts, a risky method because you can burn the board if you don't connect properly.
• 🔋 There are adapters that allow you to use the other type of battery. CR2032 battery AAA or AA. However, this is a cumbersome solution, and the thermometer will lose compactness.
• ☀️ Solar panels: Outdoor thermometers can be used to connect a miniature solar panel (e.g., from a garden flashlight) and require soldering skills and electronics.
• 🔄 Use of a battery. There are rechargeable cells. ML2032 (analogue CR2032), But they're lower in capacity, and they require a special charger.

Importantly, any power modifications take away your warranty and can knock out the thermometer, so if you're not sure about your skills, you'd better buy a new battery or go to a service center.

For experiments suitable thermometer Xiaomi LYWSD03MMC — And it's a board that's strong enough to withstand the external power connection. USB (Only for experienced users!):

CR2032 contacts:




+ (top contact) → 3.3V (USB)




− (lower contact) → GND (USB)

The voltage must be stabilized! AMS1117-3.3 downgrad 5 Into 3,3 V.

FAQ: Answers to Frequent Questions