What batteries are needed for the Xiaomi Mi Body Composition Scale 2

The Xiaomi Mi Body Composition Scale 2 has become a popular health-tracking gadget thanks to its measurement accuracy and integration with the Mi Fit (Zepp Life) app. However, like any electronic device, it requires periodic battery replacement. Many owners face confusion as Xiaomi's range of scales includes devices with different types of batteries.

Incorrect power source selection can lead to sensors malfunctioning, Bluetooth data transmission failures, or even damage to the contact group. In this article, we will discuss in detail what batteries are really needed for the second version of the scale, how to replace them correctly, and what to do if the device stops responding after installing new elements.

It's important to understand that the design of the Mi Body Composition Scale 2 is very different from the first model, which worked on four finger batteries. The second version became thinner and more compact, which required a switch to a different power format. Using the wrong elements may physically prevent you from closing the compartment or damage the contacts.

Type of required food items

The main question that arises from users is: what batteries are needed for Xiaomi Mi Body Composition Scale 2? The answer is unequivocal: this model requires four alkaline (alkaline) batteries of the AAA type, also known as “little finger” – a standard size that is easy to find in any electronics store or supermarket.

It is worth noting that the manufacturer strongly recommends the use of alkaline cells, not salt cells. Salt batteries have a lower capacity and sit down faster, especially under the load that the weight sensors create when turned on. In addition, they flow more often, which can lead to oxidation of contacts within the scales.

⚠️ Warning: Never use rechargeable batteries (Ni-Mh or Li-Ion) format AAA Their operating voltages often differ from the standard 1.5V, which can lead to calibration errors or damage to electronics.

To ensure stable operation and accuracy of body weight and fat percentage measurements, it is important that all four elements are of the same brand and degree of charge. Mixing old and new batteries or elements from different manufacturers is unacceptable, as this creates an uneven load on the system.

Differences from the first model of Xiaomi weights

A common reason for battery mistakes is confusion between models: The first version of the Xiaomi Mi Body Composition Scale (often referred to simply as Scale 1) had a thicker body and required four AA batteries to work. They are larger and have a larger capacity.

The second model, the Mi Body Composition Scale 2, received an updated design with a thinner profile and a hidden one. LED-It was the reduction in the thickness of the case that prevented engineers from using large batteries. AA, So the choice fell on a compact format. AAA. If you try to insert a finger battery into the second model, it just won’t fit in size.

Visually, you can distinguish models not only by body, but also by the markings on the bottom of the device «2» or XMTZC05HM/XMTZC02HM (depending on the regional version, while the former is often labeled as YUNMAA or XMTZC01HM.

Instructions for replacing batteries

The process of replacing the batteries in Xiaomi Mi Body Composition Scale 2 is as simple as possible and does not require special tools, except perhaps a coin or a flat screwdriver to open the latches. Before starting the procedure, make sure that the surface of the scales is dry and clean.

Turn the scales upside down, and you'll see a round battery compartment cover, usually in the center or closer to one of the edges, depending on the board revision, the lid is fixed by latches or threaded connections, gently turn the lid counterclockwise, or tuck it with a nail/tool in the intended recess.

After removing the old elements, wipe the contact plates inside the compartment with dry cloth to remove any possible dust or oxides. Insert four new AAA batteries, strictly observing the polarity indicated on the circuit inside the compartment (+ and -).

Close the lid of the compartment until you click or fit tightly, flip the scales and stand on them with one foot to activate the display, and if the numbers catch fire, then the replacement was successful.

Recommendations for the selection of the manufacturer

The quality and durability of the scales depends on the battery brand you choose. There are many options on the market, but for smart devices with a Bluetooth module, it is better to choose proven brands with high energy consumption.

• 🔋 Duracell – a classic choice that provides a stable voltage for a long time.
• 🔋 Energizer – known for its reliability and resistance to temperature changes.
• 🔋 GP Super Alkaline – good balance of price and quality, widely available.
• 🔋 Xiaomi ZMI — own alkaline batteries from the manufacturer ecosystem, optimized for their devices.

Avoid buying cheap salt batteries from unknown Chinese brands; they can run out quickly and you’ll have to change them after a month of active use; and the risk of electrolyte leakage is much higher in budget models, which can put the scales out of action forever.

⚠️ Note: If you plan to use scales in an unheated room (for example, on a balcony in winter), keep in mind that at low temperatures, battery capacity drops. In such conditions, it is preferable to use lithium batteries if their form factor and voltage are suitable, but standard alkaline cells also work more stable than salt cells.

Comparative table of nutritional characteristics

For clarity, we compare the power requirements of different generations of Xiaomi smart scales, which will help avoid mistakes when buying consumables for the entire line of smart home devices.

As you can see from the table, most current models, including the second version, have switched to AAA. However, there are exceptions, such as some versions of the Mi Body Fat Scale, which are powered by lithium CR2032 tablets. So always check the labeling on the bottom of your particular device before going to the store.

Problems after replacement and their solution

Sometimes, after installing new batteries, the scales of the Xiaomi Mi Body Composition Scale 2 do not turn on or show incorrect data. The first reason may be poor contact. Check whether the batteries are tight in the compartment. Sometimes the spring contacts weaken, and the power simply does not reach the pole.

The second common problem is the need to calibrate. After completely discharging or replacing the power, the scales may take time to warm up the sensors. Try to stand on the scale several times and get off them to activate internal processes. Also make sure that the scales are on a hard, flat surface (tile, laminate), not on the carpet.

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If the scales show dribbles or flash, try to wipe the contacts of the batteries with a blown or an alcohol wipe before installation. This will improve conductivity.

If the display lights up but the scales don't connect to the smartphone, the problem may not be with the batteries, but with the Bluetooth module. Make sure the phone has geolocation enabled (this is an Android requirement for Bluetooth scanning to work) and that the Zepp Life app has all the necessary permissions.

⚠️ Warning: Do not keep the scales upright on the side for a long time.This can cause strain gauges to shift inside the body and lose measurement accuracy.

Frequently Asked Questions (FAQ)

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For stable operation Xiaomi Mi Body Composition Scale 2 use 4 new AAA batteries of the same brand and change them with a full set at the same time.