What batteries are needed for Xiaomi scales and how to replace them

Owners of Xiaomi smart gadgets often face a situation where the accuracy of measurements decreases and the screen stops lighting up when weighing. This is a sure sign that the battery has exhausted its life and requires immediate replacement. Despite the fact that modern scales consume minimal energy, timely installation of a new battery is critical for the correct operation of the Bluetooth module and data transfer to the application.

In this article, we will discuss in detail what types of batteries are used in various models of Xiaomi and Mijia smart scales. You will learn not only about the technical specifications, but also about the nuances that will help to avoid errors in the maintenance of the device.

Many users mistakenly believe that you can install any available analogue inside, but chemical composition and voltage play a key role. Using inappropriate batteries can lead to oxidation of contacts or even failure of electronics. Let's see what engineers recommend and what option will be optimal for your model.

Types of Elements in the Xiaomi Ecosystem

Xiaomi has several scales, and the power requirements vary. Most household models, such as the Mi Body Composition Scale 2, have de facto become the standard for classic alkaline batteries, commonly referred to as "little finger" AAAs, which provide 1.5 volts of voltage, which is optimal for the integrated controller.

More advanced models, such as the Xiaomi Body Composition Scale Pro, also use four AAA-type elements. However, here the requirements for current quality may be higher due to the presence of additional sensors and a more powerful Bluetooth module for stable synchronization with the smartphone. It is important to understand that the scales do not have a built-in battery that can be charged from the network, so the autonomy depends entirely on the quality of the batteries installed.

There are also dedicated kitchen scales from sub-brand ecosystems that can run on lithium CR2032 "tablets," but for floor models this is rare. The focus is on affordability and ease of replacement. The use of rechargeable Ni-MH batteries is possible, but not always recommended by manufacturers due to voltage difference (1.2V vs. 1.5V), which can cause errors in sensor readings.

• 🔋 Standard size for most models — AAA (LR03).
• ⚡ The nominal voltage of one element is 1.5 volts.
• 📉 Using 1.2V batteries can cause a false discharge signal.
• 🛡️ Preferred chemical composition – alkaline (alkaline) batteries.

⚠️ Warning: Never mix old and new batteries, or different types or manufacturers of cells in the same compartment, which can lead to electrolyte leakage and irreversible damage to the balance contacts.

Specifications for Mi Body Composition Scale 2

The most popular model in the lineup, the Mi Body Composition Scale 2, requires four AAA batteries, a classic solution that provides enough capacity to operate for 6-12 months depending on the frequency of use. The compartment is designed to minimize contact resistance, but the quality of the batteries themselves comes to the fore.

Engineers recommend using only alkaline batteries. Salt-based batteries, while cheaper, have significantly lower capacity and can flow faster, especially if scales are used irregularly. The difference in price between a salt-based battery and a quality alkaline battery is minimal, but the consequences of using them can be drastically different.

When you install it, it's important to observe the polarity indicated at the bottom of the device. An error in the orientation of the plus and minus will cause the scales to simply not turn on. Fortunately, the electronics are protected from short circuit in case of improper installation, but it is not worth the risk. After replacing, it is recommended to wipe the contacts with dry cloth for better connection.

It's worth noting that scales consume energy primarily when weighing and passing data for short periods. Standby consumption is almost zero. So one high-quality package of 4 pieces will last you a long time. Don't skimp on this component, because scales are an accurate measuring instrument.

Features of the Xiaomi Scale Pro model

Xiaomi Body Composition Scale Pro is a premium device with improved sensors and a glass platform. Despite more complex features, including high-precision body impedance analysis, it also runs on four AAA batteries.

Unlike the basic version, the Pro model uses Bluetooth Low Energy more actively for constant synchronization. If you notice that the scales often lose connection to the phone or data is transmitted with a delay, the first thing to do is check the charge of the batteries. Even if the screen is burning bright, the peak load during data transfer can cause voltage drawdown on old batteries.

It's a model that's not recommended for cheap salt cells, and its internal resistance is too high for a Bluetooth module to work smoothly when transmitting data packets, and it's better to buy a quality brand once than change the kit every two weeks.

• 📡 Stable voltage required for Bluetooth 5.0.
• 📊 Impedance sensors are sensitive to power changes.
• 🔋 Recommended life of the kit - up to 1 year.
• 🚫 Avoid using memory-effect batteries.

Instructions for replacing the power element

Xiaomi's battery replacement process is as simple as possible and requires no special tools, you'll only need a new pack of batteries and possibly a dry wipe to wipe the contacts. The whole procedure takes no more than two minutes.

First, turn the scales down with the platform. On the bottom panel, you'll see the battery compartment closed with the lid. In some models, the lid is fixed with latches, in others, it may take a slight effort to shift. Carefully open the compartment and remove the old elements.

Before installing new batteries, carefully inspect the contacts inside the compartment. If you notice white plaque or traces of oxidation, carefully remove them with a dry cotton swab. Then insert the new batteries, strictly following the direction indicated in the diagram (+/-). Close the lid until the characteristic click.

Sequence of action:


1. Turn the scales over.




2. Open the battery bay.




3. Remove old elements.




4. wipe the contacts (if necessary).




5. Insert 4 new AAA batteries.




6. Close the lid.

Once installed, the scales can automatically turn on and calibrate, if the screen catches fire and zeros or current weight, the procedure is successful, and if the scales don't respond, try to check the correct polarity setting again.

⚠️ Warning: If you do not plan to use the scale for a long time (more than a month), remove the batteries from the compartment. this will prevent the risk of leakage of the electrolyte and corrosion of contacts.

💡

Rub the metal contacts inside the compartment with an alcohol wipe once a year, even if you don’t change the batteries, which will ensure perfect contact and eliminate false discharge signals.

Comparison of battery manufacturers

There are many brands in the market that produce batteries. For Xiaomi smart scales, it is important to choose a product that keeps the voltage under load. Cheap counterparts often have less real capacity than claimed and fail faster.

The table below compares the popular types of batteries suitable for use in scales, and pay attention to the type of chemistry and the expected lifespan.

As you can see from the table, alkaline batteries are the middle ground. They are available in any store, cost reasonable money and ensure the stable operation of the device. Lithium variants (not to be confused with Li-Ion 3.7V batteries!) last longer, but their price can be 3-4 times higher, which is not always justified for weights.

Using Ni-MH batteries (rechargeable) makes sense if you change batteries very often, for example, in a house with a large family, where the scale is used dozens of times a day. However, remember the lower voltage of 1.2 Volts. Some devices can perceive 1.2 V as low charge and constantly beep or blink the indicator.

💡

The best choice for Xiaomi scales is high-quality alkaline AAA batteries from well-known manufacturers (Duracell, Energizer, GP, Sony).

Frequent problems and their solution

Even after the battery is replaced, users can face a number of problems, often the scales show an error or not turn on, this may be due to a factory insulation film that they forgot to remove, or oxidized contacts.

If the scales flash or show the battery symbol immediately after replacement, try the following steps: First, make sure the batteries are inserted correctly; second, wipe the contacts with alcohol; third, try to slightly rotate the batteries in the compartment to remove the oxide film from the contacts.

Sometimes the problem lies in the Mi Fit or Xiaomi Wear app itself. If the scales don't sync, try removing the device from the Bluetooth list in your phone's settings and doing the pairing again. Make sure the app has all the necessary permissions to work with geolocation and Bluetooth.

• 🔄 Reset the scales by taking the batteries out 10-15 seconds.
• 📱 Reconnect the device in the Mi app Home/Fit.
• 🧹 Clean the platform and bottom of the scales of dust and pile.
• 📍 Set the scales on a solid surface (not on a carpet).

If nothing works, it may have a hardware malfunction, but 95% of the time, the problem is solved by properly installing quality batteries, and don't rush to carry the scales to the service until you eliminate the banal discharge.