The question of what kind of batteries are required for Xiaomi smart scales often arises before users at the most unexpected moment - when the gadget suddenly stops turning on or begins to show a low-charge error. Modern Body Fat Scale and Mi Body Composition Scale have become an integral part of the smart home ecosystem, but their autonomy depends on the correctness of the selected energy base. Many owners mistakenly believe that all the brand devices run on the same batteries, which leads to the purchase of inappropriate sizes.
In fact, Xiaomi’s range of scales is quite diverse, and the requirements for current sources can vary significantly depending on the model’s year of release and its functionality. Some versions have built-in Li-Pol batteries that cannot be replaced without opening the case, while other classic models use standard interchangeable elements. Understanding these differences is critical to extending the life of your smart device.
In this article, we will discuss in detail what batteries are used in popular Xiaomi scale models, how to replace them correctly without damaging sensitive electronics, and why using cheap analogs can lead to distortion of body composition data.
Types of power elements in the Xiaomi line
The first thing you need to decide on is the size of the element you use. In the vast majority of cases, Xiaomi’s classic floor scales are powered by four AAA standard batteries, often referred to as “little fingers,” which are compact 1.5V batteries that keep sensors and Bluetooth modules running smoothly for a long time.
There are exceptions, however: Some specialized models, especially those that are professionally oriented or have advanced functionality, may require AA-type cells or even have a built-in battery. It is important to carefully inspect the battery compartment or technical documentation before going to the store, as physically inserting a larger battery into the AAA compartment will not work.
The chemical composition of the elements deserves special attention. Cheap salt batteries are not recommended for scales with (high precision) sensors, as they quickly sit under load and can leak, damaging contacts. The best choice is alkaline (Alkaline) elements from proven brands or lithium analogues, which are better able to tolerate temperature changes.
⚠️ Warning: Never mix different types of batteries (e.g. old and new, alkaline and salt) in the same device, which can cause the scales to work improperly, distort the weight readings, and even damage to the internal circuitry due to uneven current output.
To ensure maximum accuracy of measurements of weight and percentage of fat, manufacturers recommend using only high-quality batteries. Cheap analogues may not give the necessary voltage at peak moments of Bluetooth connection, which will lead to recalibration or inability to synchronize with the smartphone.
Compatible with Mi Body Composition Scale
The Chinese giant’s most popular smart scale series is the Mi Body Composition Scale line, which traditionally requires four AAA batteries to be installed, making them fully autonomous and charger-independent, but requiring periodic replacements.
More advanced versions, such as the Mi Smart Scale 2 or Mi Body Composition Scale 2, also most often use the standard set of 4 AAA elements. The design of the compartment is usually designed to ensure tight contact and reliable fixation. However, in some revisions or regional versions, the manufacturer may change the requirements, so visual verification is always a priority.
It is worth noting that there are Xiaomi scale models that are part of the Mijia ecosystem but are released under sub-brands (e.g. Yunmai), which often have similar power patterns, but the location of the contacts and the type of batteries required (sometimes AA instead of AAA) may differ.
- 🔋 Mi Body Fat Scale 1: 4 x 4 AAA (1.5V).
- 🔋 Mi Body Fat Scale 2: 4 x 4 AAA (1.5V).
- 🔋 Mi Smart Scale 2: requires 4 x AAA (1.5V).
- 🔋 Yunmai Mini: It often requires 4 x AAA, But there are versions of AA.
If you own one of the newest models with a color display or advanced communication features, make sure the batteries you choose have sufficient capacity.Although the scales consume little power in standby mode, the weighing and data transfer process over Bluetooth requires short-term but significant current that older or substandard batteries may not provide.
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Buy batteries from the same package and the same manufacturer, which ensures the same residual life and chemical composition, which will prolong the life of the scales and ensure the stability of readings.
Instructions for replacing batteries in scales
Xiaomi's battery replacement process is as simple as possible and requires no special tools, except perhaps a small coin or a flat screwdriver. However, to avoid damaging the case and ensure the device works properly after replacement, it is recommended to follow a certain sequence of actions. First, turn the scales with the working surface down on the soft fabric so as not to scratch the glass or plastic.
On the bottom panel, you'll find a battery compartment that's covered by a lid. In some models, the lid is fixed by latches, in others, by a screw. If there's a screw, gently twist it counterclockwise. Once the compartment is opened, remove the old elements. Before installing the new batteries, it's highly advisable to wipe the contacts inside the compartment with a dry lilaceless wipe or cotton swab to remove oxides or dust.
Install new batteries with strict polarity as indicated at the bottom of the compartment (+ and -). Incorrect installation can lead to short circuit. Once installed, close the lid and lock it tightly. Turn on the scales by standing on them to check the performance. If the device shows weight but does not connect to the phone, try pairing again in the application.
☑️ Battery replacement process
After the batteries are replaced, smart scales may require recalibration, which is usually done automatically at the first weigh-in, when the device shows zeros and then your weight. If that doesn't happen, try pressing the reset button (if there is one), or just waiting a few minutes before going to sleep.
Charge problems and their solution
Even with the right batteries, users can experience charge indication problems. Xiaomi scales are equipped with a voltage monitoring system, and if it falls below a certain threshold, a notification appears on the screen or in the application. However, sometimes this message can be false if the contacts are contaminated with oxide or if the batteries have been in storage for too long.
A common problem is the use of rechargeable Ni-MH cells (nickel-metal hydride) with a rated voltage of 1.2 V, whereas standard alkaline batteries give out 1.5 V. Libras can perceive 1.2 V as a critically low charge, even if the battery capacity is full, resulting in the device constantly signaling discharge or operating unstable.
| Type of element | Nominal voltage | Recommendation for weights | Risk of trouble |
|---|---|---|---|
| Alkaline (Alkaline) | 1.5 V. | Recommended | Low. |
| Salt (Zinc-Carbon) | 1.5 V. | Not recommended | High (leak, quick discharge) |
| Ni-MH (Rechargeable) | 1.2 In V. | Carefully. | Medium (low charge error) |
| Lithium (Li-FeS2) | 1.5 V. | Great. | Low (expensive) |
If the scales stopped turning on immediately after the battery was replaced, check if you removed the protective film from the new elements (sometimes it is found on the contacts) and if they fit tightly, and it is also worth checking the spring contacts for deformation - if they are too stretched, the contact may disappear when vibrating.
⚠️ Warning: If you notice white plaque or crystal formations on old batteries or inside the compartment, do not touch them with your bare hands. This is a caustic electrolyte. Carefully remove it with a dry brush or cotton swab dipped in a weak solution of citric acid, and let it dry.
Effect of batteries on measurement accuracy
Many users underestimate the impact of cell quality on the accuracy of smart scales. The bioimpedance analysis (BIA) principle used to determine the percentage of fat, muscle and water relies on the passing of a weak electric current through the human body, the stability of this current directly depends on the voltage of the power source.
With saturated or substandard batteries, the resistance of the chain can be measured with error, which will lead to incorrect body composition data. The weight can be displayed correctly (since the strain gauges are less sensitive to voltage fluctuations within certain limits), but the percentage of fat or muscle mass can jump, so replacing the batteries is not only a matter of turning on the device, but also a matter of reliability of statistics.
In addition, weak batteries can cause problems with Bluetooth connection. The wireless module requires stable power to transfer data packets to the smartphone. If the voltage is not enough, the scales can turn on, but do not find the device in the Mi Fit or Zepp Life application, or break the connection during synchronization.
Why do scales eat batteries quickly?
For users who weigh several times a day or use scales in a family of several, it is recommended to have a spare set of quality batteries.A sharp voltage drop in the middle of a series of measurements can interrupt the process and not keep the data in history, which will violate the integrity of your health statistics.
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The quality of the batteries has a direct impact not only on the time of operation, but also on the accuracy of the calculation of bioimpedance parameters (fat, muscle, water).