Xiaomi's temperature-sustaining thermos have become popular thanks to a combination of technology and affordable prices. Models like the Mijia Smart Kettle or Viomi Smart Thermos are equipped with electronic controls that require battery power. Over time, the battery runs out, and the the thermos stops correctly displaying temperature or turning on. Replacing the battery is a simple procedure, but with nuances that many people don't know about.
In this article, you will find step-by-step instructions with a photo, tips on choosing a battery, and answers to frequent questions. We will discuss how to avoid disassembly errors, what tools will be required, and what to do if the thermos does not work after replacing, and this information is relevant for most Xiaomi and Viomi models with electronic display released after 2018.
What Xiaomi Thermoses Need Battery Replacement?
Not all thermoses of the brand have a removable battery, but only in electronic display or touch-controlled models, and here are the main series where replacement may be required:
- 🔋 Mijia Smart Kettle (1.6L/1.2L) — Thermos with Bluetooth and control via app;
- 🔋 Viomi Smart Thermos (Series) V-TH01, V-TH02) — touch-panel and backlight;
- 🔋 Xiaomi Youpin Smart Thermos – budget options with a temperature indicator;
- ❌ Conventional thermoses without electronics (e.g. Xiaomi Stainless Steel Thermos) – batteries do not have.
If your thermos stops turning on, flashes a light or shows the wrong temperature, there is a 90% chance that the battery is dead, except if the thermos doesn’t hold heat at all (even without electronics), it’s the vacuum bulb, not the power cell.
Which battery to replace?
Xiaomi thermoses use lithium batteries such as the CR2032 (3 Volts) which are standard batteries that can be purchased from any electronics store or ordered online.
| Parameter | Recommendation | Why is it important? |
|---|---|---|
| Type of battery | CR2032 (3V, Li-MnO2) | Other types (such as CR2026) are thinner and will not fit in size. |
| Brand | Duracell, Energizer, Panasonic | Cheap no-name batteries discharge quickly and can leak |
| Capacity | 220-240 mAh | Batteries with a capacity below 200 mAh will last less than 6 months |
| Date of production | Not older than 1 year | Lithium batteries lose up to 20% of their charge per year of storage |
⚠️ Note: Do not use rechargeable batteries (ML2032 or LIR2032)! They have a different tension (3.6V) Also, avoid batteries labeled "Super Heavy Duty" -- these are alkaline cells that are incompatible with the device.
Where to buy it?
- 🛒 Offline: M. Video, Eldorado, Fix Price (in the Battery Department for Motherboards);
- 🌍 Online: AliExpress (search by CR2032 original), Wildberries, Ozone;
- 🔧 Xiaomi Service Centers (sometimes selling original batteries).
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Before buying, check the battery with a tester - even a new one can be discharged. Normal voltage: 3.0-3.3 Volts.
Preparing for replacement: security tools and measures
To replace the battery, you will need:
- 🔧 Flat screwdriver (or mediator for disassembly);
- 🔨 Cross screwdriver (if the lid on the screws);
- 🧲 Magnet or tweezers (to avoid losing small details);
- 📸 Phone for photographing the process (in case of errors during assembly);
- 🧴 Alcohol wipes (for cleaning contacts).
⚠️ Warning: Do not disassemble the thermos in direct sunlight or in high humidity. Condensation inside the case can damage the electronic board. Also avoid excessive force - plastic latches on the lid are fragile!
If the thermos was in use, before disassembly:
Cool the thermos to room temperature (if it was hot)|
Pour out the remaining liquid and dry the inner flask |
Disable the thermos from the application (if connected via Bluetooth)|
Take a photo of the initial state of the cover and display-->
Step-by-step: how to disassemble thermos and replace the battery
The replacement process takes 15-20 minutes and follow the instructions carefully so as not to damage the sealing gums or contacts.
Step 1 Removing the top cover
Turn the thermos cover counterclockwise (if the model is threaded) or press the latch on the side (if the lid is clipped). In some models (Viomi V-TH02), the lid is mounted with a screw under a rubber plug, you need to screw it with a screwdriver.
Step 2: Removal of the electronic module
Under the lid, you'll see a plastic module with a display. Carefully put it in a flat screwdriver on the side, it's holding on to 2 or 4 latches. Don't pull the wires!
What to do if the module is not removed?
Step 3: Replace the battery
The CR2032 battery is in a special compartment on the board, put it in a screwdriver or tweezer, then insert a new one, observing polarity (plus up), and wipe your contacts with an alcohol napkin beforehand.
Step 4: Assembly of thermos
Put the electronic module back in, make sure all the latches are in place. Twisted the lid (or snapped it) and checked the tightness -- pour water and flip the thermos. If the fluid doesn't leak, the assembly was successful.
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After replacing the battery, the thermos may not turn on immediately - wait 1-2 minutes until the capacitors on the board charge.
What if the thermos doesn’t work after replacement?
If the thermos does not turn on or behaves incorrectly after installing a new battery, check the following:
- 🔄 Battery polarity – flip it and try it again;
- 🔌 Contacts - clean them from oxidation with a cotton swab soaked in alcohol;
- 📱 Resetting – If the thermos has been synced to the app, remove it from Mi Home and plug it back in again;
- 🔧 Board damages – inspect the module for cracks or lanes that have broken off.
⚠️ Warning: If a thermos squeaks or flashes a red light, it's a sign of a short circuit. Remove the battery immediately and check the charge for moisture or corrosion.
If the thermos is turned on but shows an incorrect temperature, calibrate:
- Pour water with a temperature of ~40°C into the thermos (check with a separate thermometer).
- Press the on button for 10 seconds until the display blinks.
- Wait 1-2 minutes - the thermos will automatically adjust the readings.
How to extend the life of a battery in a Xiaomi thermos?
The average lifespan of a CR2032 battery in a thermos is 6-12 months, to extend this period:
- ⚡ Turn off Bluetooth thermos if you don’t use smart features;
- 🌡️ Do not leave the thermos on without liquid – sensors work idle;
- 🔋 Keep the thermos with the battery removed if you don’t use it for more than a month;
- 📱 Update your firmware through the Mi Home app – new versions optimize energy consumption.
Also avoid extreme temperatures: do not put a thermos in the freezer or near heat sources (such as on the stove) this speeds up battery discharge and can damage the electronic module.
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If you rarely use smart features, consider buying a thermos without electronics — it’s cheaper and doesn’t require maintenance.
Where to replace the battery if you can’t do it yourself?
If you are not confident in their abilities or the thermos has a complex design (for example, the Viomi V-TH02 with a touch screen), it is better to contact the service.
| Option | Cost | Pluses | Cons |
|---|---|---|---|
| Xiaomi Service Center | 500–1200 ₽ | 3-6 months warranty, original parts | Long wait (7-14 days), high price |
| Private workshops | 300–800 ₽ | Fast (1–2 days), often cheaper | Risk of unoriginal parts, no guarantee |
| Independently. | 50–200 ₽ (battery) | Saving time and money | Risk of damaging thermos during disassembly |
Before the service visit:
- Check if they work specifically with your thermos model.
- Ask if they have a job guarantee.
- If the thermos is guaranteed, do not open it yourself, otherwise the warranty will burn.