What batteries are needed for Xiaomi smart scales: a complete guide to choosing and replacing

Xiaomi's smart scales have become an integral part of a healthy lifestyle for millions of users. They accurately measure not only weight, but also fat percentage, muscle mass, body water level - but all these functions depend on one small but critical element: batteries. It would seem that it could be easier than replacing a power source? However, many face problems: scales do not turn on after replacement, show incorrect data or quickly discharge.

In this article, we’ll look at which batteries are suitable for different Xiaomi smart scale models (including the popular Mi Body Composition Scale 2, Xiaomi Smart Scale 2, and Xiaomi Mi Scale), how to replace them properly so as not to break the device, and give tips on extending the life of the device.

What batteries are needed for Xiaomi smart scales: models and types

All Xiaomi smart scales use one of two types of batteries: AAA (little finger) or CR2032 (tablet). The specific type depends on the device model.

Important: Even if your model uses 4 AAA batteries, they should be of the same type and brand.Mixing alkaline and lithium batteries in one device can lead to sensors malfunctioning or even damage to the board.

For models with CR2032 (for example, the Mi Scale first version), only a lithium battery of this type will work. Alkaline analogues (LR2032) have a lower voltage (1.5V instead of 3V) and will not provide stable operation.

Alkaline vs Lithium Batteries: Which Is Best for Xiaomi

The choice between alkaline and lithium batteries has a critical impact on measurement accuracy and weight life.

• 🔋 Alkaline (e.g. Duracell, Energizer): cheaper but quicker discharge at high loads, suitable for rare use (1-2 times a week).
• ⚡ Lithium (e.g. Energizer Ultimate Lithium): Expensive, but last 2-3 times longer, hold voltage more stable, ideal for daily weighing.
• ⚠️ Zinc-Chloride: Not recommended, but quickly set and may leak.

For Xiaomi smart scales, the best choice is AAA lithium batteries (if the model requires AAA) or CR2032 from proven brands (e.g. Maxell, Panasonic, Varta). Cheap no-name batteries often have unstable voltages, which leads to:

• 📉 Failures in weight measurement (indications "jump").
• 🔄 Spontaneous resetting of scales.
• 🚫 Lost communication with the Mi Fit application.

⚠️ Warning: If the scales show a Lo error (low charge) after replacing the batteries, check the polarity of the installation. Incorrectly inserted batteries can damage the power controller.

Step-by-step: how to replace batteries in smart scales Xiaomi

Replacing batteries seems like a simple procedure, but many users make mistakes that lead to a breakdown.

1. Preparation: Turn the scales over and find a battery compartment, which is closed with a lid on most models that is shifted to the side or opened with a coin (for CR2032).
2. Removing old batteries: carefully remove them, avoiding contact with corrosion (if any).AAA may require light pressing of the contact.
3. Contact cleaning: wipe the contacts in the compartment with a dry cloth or cotton swab soaked in alcohol. Contact oxidation is a common cause of unstable work.
4. Installation of new batteries: insert them strictly according to the polarity scheme (+/−), For the Mi Body Composition Scale 2, the order of installation: two batteries + up, two — − upward.
5. Check: Turn on the scales and make sure that the display appears greeting (for example, 0.0).If the screen does not light up, check the density of the batteries.

If after the weight change is not included:

• 🔄 Try restarting the device: press and hold the on button (if any) for 10 seconds.
• 📱 Reconnect the scales to the Mi Fit app: remove the device from the list and add again.
• 🔋 Check the battery voltage with a multimeter (should be at least 1.5V for AAA or 3V for CR2032).

⚠️ Warning: Don't use expired batteries, they can leak and damage electronic components of scales, alkaline batteries up to 5 years, lithium batteries up to 10 years.

Top-5 batteries for smart scales Xiaomi: rating on reliability

Not all batteries are equally useful for smart scales, and we tested popular models and ranked them according to the criteria: voltage stability, duration of operation and no leaks.

For models with CR2032, Varta CR2032 or Sony CR2032 batteries are also suitable - they have corrosion protection and stable 3V voltage.

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If you rarely use a scale (once a month), take out the batteries for downtime, which will prevent them from draining and leaking.

Frequent problems after replacing batteries and how to fix them

Even if you have the right batteries, the scales may not work properly, and let's look at the typical problems and ways to fix them:

• 🔄 Libras are constantly resetting, because of unstable battery voltage, try replacing them with lithium or clearing the contacts of oxidation.
• 📵 Do not connect to Mi Fit: reset the weight settings (press the power button for 15 seconds) and reconnect the device in the app.
• ⚖️ Weight readings are unstable: check if the scales are even on the surface, and the reason may be the discharged batteries - replace them even if they are new (may be defective).
• 🔋 Batteries discharge quickly: If the scales have been running for less than a month, the problem is, likely, short circuiting the contacts.

If after replacing the batteries, the scales show an Err or --- error, this may mean:

• Incorrectly installing batteries (check polarity).
• Getting moisture inside the body (dry the scales for 24 hours in a dry place).
• Damage to sensors (repair required).

How to extend the life of batteries in smart scales

The average battery life in Xiaomi scales is from 6 to 18 months, but it can be increased by 1.5-2 times, following simple rules:

• 🔌 Turn off the power scales: If you don't use them for more than a week, take the batteries out. This will prevent them from running slowly.
• 🧹 Store the scales in a dry place: humidity accelerates the corrosion of contacts and battery discharge.
• 🔋 Use high-quality batteries: cheap ones often have high self-discharge (lost up to 30% of their charge in a year of storage).
• 📱 Update your firmware: newer versions of the weighting software optimized energy consumption. Check for updates in Mi Fit.

For models with CR2032, it is also useful:

• Do not touch the battery with your bare hands - fatty traces accelerate the discharge.
• Store spare batteries in the original packaging at room temperature.

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Lithium batteries last longer than alkaline batteries, but they cost more, and they pay off for their daily use with a rare replacement.

Where to buy batteries for Xiaomi: checked stores and prices

Xiaomi smart scale batteries are sold at any electronics store, but we recommend buying them from trusted locations to avoid counterfeiting.Average prices for 2026:

Beware of counterfeits on marketplaces, signs of poor-quality batteries.

• 🏷️ No hologram or protective elements on the package.
• 📦 Packaging crumpled or with typos in the brand name.
• ⚖️ The weight of the batteries is less than the stated weight (e.g. AAA should weigh ~11.5 g).

To verify the authenticity of Duracell or Energizer batteries, you can use official brand applications, where there is a function of scanning the QR- code on the package.

FAQ: Frequent questions about Xiaomi smart scale batteries