Xiaomi’s modern smart scales have become an essential attribute for those who follow health and strive for perfect physical fitness. However, even the most advanced technology can stop pleasing accuracy or completely turn off at the most inopportune moment. Most often, the problem lies not in complex electronics, but in banally discharged batteries. Many owners of the Xiaomi Mi Body Composition Scale face the question: what batteries are needed for the Xiaomi Mi scales and can we replace the standard ones with more powerful analogues?
Choosing the right energy source is critical to the proper operation of the Bluetooth module and impedance sensors. Using the wrong batteries can lead to rapid discharge, distortion of data on the percentage of fat or muscle mass, and in the worst case, oxidation of contacts. In this article, we will discuss the technical requirements, consider the types of batteries and compile a ranking of the best manufacturers for your model.
To start with, it’s worth clarifying that most models, including the popular Mi Body Composition Scale 2 and Mi Smart Scale 2, use the standard battery format. However, the design of the compartment and the voltage requirements can have nuances. Understanding which batteries are really needed will help avoid unnecessary trips to the store and ensure that the device will work steadily for a long time.
Type and specification
The main standard for Xiaomi scales is the AAA format, often referred to as “little finger” in everyday life, which are compact cylindrical elements that fit perfectly into the thin body of the device. It is important not to confuse them with larger AA batteries, as they will not physically fit in the bay and can damage the contacts if installed.
The nominal voltage of a standard alkaline battery is 1.5 Volts. Xiaomi scales usually require four such cells to add up to 6 Volts. It is critical to use cells with a voltage of strictly 1.5 V, since rechargeable Ni-MH batteries have a voltage of 1.2 V, which may not be enough for a stable Bluetooth connection. Although some users note the work with batteries, the manufacturer does not guarantee the correctness of measurements at reduced voltage.
Chemical composition also plays a role. Alkaline batteries are optimal for scales, which provide a stable discharge current. Salt variants (Zinc-Carbon) are better not to use, since they discharge faster under load and have a high risk of leakage of electrolyte, which can irrevocably spoil the electronics of the scales.
- 🔋 Format: AAA (LR03/LR3) — The basic standard for all models.
- ⚡ Voltage: 1.5 Volts per element (total 6 V).
- 🧪 Type: Alkaline is preferred over lithium or salt.
- 📏 Number: 4 pieces in the complete set.
⚠️ Warning: Never mix old and new batteries, or elements from different manufacturers or chemical compounds in the same compartment, resulting in uneven discharge and may cause leakage of a less charged element.
Compatible Xiaomi weight models
Xiaomi’s scale range is quite extensive, and while they may differ in design, they have uniform battery requirements, making life easier for users who don’t need to look for rare specific batteries for each new version of the device.
The most popular model is the Xiaomi Mi Body Composition Scale 2 (often labeled as XMTZC05HM).This is the most commonly sold variant, with white or black glass coating. It is followed by the Mi Smart Scale 2 (XMTZC02HM), which has a monochrome screen and slightly simpler functionality, but the same battery compartment.
Special attention should be paid to professional or medical versions of scales, which may have additional features, such as connecting to external monitors or a more powerful transmitter.However, even in devices such as the Xiaomi Body Fat Scale professional series, manufacturers are striving to maintain compatibility with the common AAA size for the convenience of users.
If you have any doubts about the model, turn the scales over and look at the sticker on the bottom panel, which shows the exact model number, which can be checked with the table below to make sure that the battery is correctly selected.
| Model of the device | Typical size | Number (s) | Features |
|---|---|---|---|
| Mi Body Composition Scale 2 | AAA (LR03) | 4 | Glass surface, Bluetooth 5.0 |
| Mi Smart Scale 2 | AAA (LR03) | 4 | Monochrome screen, basic functionality |
| Mi Body Composition Scale 1 | AAA (LR03) | 4 | First generation,/white body |
| Xiaomi Smart Scale 2 | AAA (LR03) | 4 | Color screen, improved sensor |
Instructions for replacing the elements of power
Xiaomi's battery replacement process is as simple as possible by the company's engineers and doesn't require special tools like screwdrivers or tweezers. All you need is new batteries and a few minutes of free time. However, even in such a simple procedure, there are nuances that will prolong the life of the device.
To start, flip the scales with the work surface down onto a soft cloth or mat so you don't scratch the glass or plastic. Find a round battery compartment cover that's usually located in the center of the bottom panel. To open it, you need to turn the lid counterclockwise until you have a characteristic click or matching unlock marks.
After removing the old elements, carefully examine the contacts inside the compartment. If you notice traces of oxidation or white plaque, gently wipe them with a dry cotton swab or a blower. Insert new batteries strictly observing the polarity indicated at the bottom of the compartment (+ and -). After installation, close the lid, turning it clockwise to the point.
☑️ Pre-replacement checks
When you change the scales, you may not be able to switch on instantly. Try pressing the platform to activate the sensors. If the Mi numbers or logo light up on the screen, you're successful. Don't forget to check the connection to your smartphone in the Mi Fit or Xiaomi Wear app, as sometimes you need to re-synchronize after you're completely discharged.
⚠️ Warning: If the compartment cover closes with force or not to the end, do not use force. Check the correct installation of batteries and the absence of foreign objects, so as not to damage the thread or latches.
Manufacturer's Choice: Which Batteries Are Better
The battery market is full of supply, and it can be difficult to choose a really high-quality product. For Xiaomi scales that consume energy with pulses (during weighing and data transfer), not only capacity is important, but also stress stability under load. Cheap salt batteries can show good results on an in-store tester, but quickly “sit” when used in real life.
Leaders in the alkaline battery segment are traditionally considered brands Duracell and Energizer. their products (Turbo or Max series) are characterized by high energy density and reliable leak protection. Despite the higher cost compared to their counterparts, their service life in scales can be 2-3 times higher, which in terms of time of use makes them more profitable.
Panasonic (Evolta series) and IKEA (LADDA) batteries are a good alternative, and they often win in direct current durability tests. Xiaomi or ZMI branded batteries are also a great choice, as they are tailored to the electronics of Mijia ecosystem devices and are guaranteed to avoid conflict.
- 🏆 Duracell Turbo: Lifetime leader, ideal for Bluetooth devices.
- 🔋 Energizer Max: High reliability and leak protection.
- 💰 IKEA LADDA / Panasonic: Optimal value for money.
- 📱 Xiaomi / ZMI: Ensuring compatibility with the ecosystem.
💡
Buy batteries only in large chain stores or official points of sale. In markets and small stalls, you are likely to purchase counterfeit or expired goods that do not hold a charge.
Also worth mentioning is lithium batteries (Li-FeS2), which have a voltage of 1.5 V and work at low temperatures. They are much lighter than alkaline batteries and last longer, but they cost 5-10 times more. For scales standing in a warm apartment, it usually makes no sense to overpay for lithium, unless you plan to use the scales in an unheated room.
Connection problems after replacement
Sometimes users are faced with a situation where the scales are turned on, the numbers on the display appear, but the smartphone stops seeing the device via Bluetooth. This is a common problem associated with the fact that the communication module may “hang” or not have time to initialize after a voltage surge when installing new elements.
The first step in the diagnosis is to completely shut down the device, remove all 4 batteries from the bay and wait 10-15 seconds, and this will release the residual charge from the capacitors and reboot the scale controller, then insert the batteries again and try pairing through the application.
If the reboot didn't work, check the settings of the smartphone itself. Make sure the Mi Fit app (or similar) has geolocation permission and Bluetooth permission, sometimes removing the device from the list of conjugated phone settings and re-associating it as a new gadget helps.
What to do if the scales are 0.0 or ERROR?
Also, it is worth considering that when the old batteries were completely discharged, the application could save the old connection data. Resetting the weight settings (if such a function is provided by the model through prolonged button retention or a sequence of presses) can help restore factory communication parameters.
How to extend the life of batteries
While Xiaomi’s modern scales are energy efficient, improper operation can significantly shorten the lifespan of the batteries.The main energy consumer in these devices is not the weighing process itself, but the Bluetooth module, which is constantly looking for a connection or maintaining it.
To save charge, try not to keep the scales in close proximity to your smartphone unless you plan to weigh right now. Constant attempts to connect with a weak signal make the transmitter work at high power. Also, do not look too often in the application to check the history if the scales are not in sleep mode.
Another important aspect is temperature: batteries, especially alkaline ones, are sensitive to cold; if the scales are on a cold balcony or in an unheated hallway in winter, their capacity can drop by 30-40%; the optimal temperature for work and storage is room temperature, ranging from +15 to +25 degrees Celsius.
💡
The most effective way to extend the life of batteries is to remove them if you don't plan to use the scale for a month or longer, which will prevent self-discharge and the risk of leakage of the electrolyte.
Rub the bottom panel of the scales from dust regularly. The layer of dust between the legs of the scales and the floor can create static electricity or micro-shifts that cause the sensors to work harder, consuming excess energy to stabilize readings.