How to Set Up Xiaomi Body Composition 2 Smart Scales: A Complete Guide from Connection to Calibration

Xiaomi Body Composition 2 is not just a weight measurement device, but a full-fledged body composition analyst with 13 key metrics, from fat percentage to muscle mass and water level. However, many users face problems already at the setup stage: the device does not connect to the phone, shows incorrect data or suddenly resets, the reason most often lies in the wrong initial configuration or ignoring the nuances of synchronization with the Xiaomi ecosystem.

In this article, you’ll find detailed step-by-step instructions for setting scales, from unpacking to fine calibration, and solving common errors that aren’t described in the official documentation. We’ll look at how to properly link a device to Mi Fit and Mi Home apps, configure user profiles, interpret measurements, and even integrate data with Google Fit or Apple Health, and focus on hidden features that the manufacturer doesn’t advertise, such as manually entering parameters to improve accuracy or resetting settings without losing measurement history.

If you have just purchased Xiaomi Body Composition 2 or have been using it for a long time but want to improve the accuracy of readings, this article will be your practical guide with proven life hacks.

1.Preparation for the first inclusion: what to do before setting up

Before you start connecting the scales, follow the mandatory preparatory steps that will save you hours to correct errors later, and many users skip this stage and then face synchronization problems or incorrect data.

First, check the complete set of the device:

• 📦 Xiaomi Body Composition 2 (model) XMTZC05HM)
• 🔋 4 type batteries AAA (bundled or purchased separately)
• 📄 Short instructions in several languages (Russian is not always available)
• ⚠️ There's no cable. USB — No charging is required, the scales work from batteries!

Second, prepare your smartphone:

• 📱 Make sure your phone has one of the latest versions of Android (at least 6.0) or iOS (at least 12.0).Older versions of the OS may not support Bluetooth 5.0, which is necessary for a stable connection.
• 🔄 Update the Mi Fit and Mi Home apps to current versions via Google Play or the App Store.Outdated versions often cause sync errors.
• 📶 Turn on Bluetooth and geolocation (yes, scales need location data to work properly!).
• 🚫 Close all background apps that may conflict with Bluetooth (fitness trackers of other brands, games with gamepads, etc.).

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If you have an iPhone, go to Settings before setting up. → Confidentiality → Geolocation services and enable Mi Fit access in "When in use" mode. Without this, the scales will not be able to determine your region for correct calculations.

Finally, choose the right place for the weights:

• 🏡 The floor should be flat and hard (tile, laminate, wood) Carpets with long pile or soft coatings distort the reading.
• 🌡️ The temperature in the room - from 10°C to 40°C. At lower or higher values, sensors may fail.
• 🚿 Avoid wet spaces (bathroom is only suitable if the scales are in the dry area).

Installation of batteries and first activation: step-by-step instructions

To start with, the physical setup of the device is a big part of the game, and unlike many smart scales, the Xiaomi Body Composition 2 doesn't have a built-in battery, it runs on 4 batteries. AAA. This is both a plus (no need to wait for charging) and a minus (you will have to change them periodically).

To install the batteries:

1. Turn the scales over and find the battery compartment at the bottom (it is covered with a plastic cover).
2. Carefully tuck the lid with a nail or a flat object (such as a plastic card). Do not use metal tools - they can scratch the body.
3. Insert batteries according to polarity (marking) + and − inside the compartment).
4. Close the lid before you click. Make sure it sits tightly - otherwise the scales may show a Lo error (low charge).

Once the batteries are installed, the scales will automatically turn on, and you'll see the Mi logo on the display, and then the words 0.0, which means that the device is ready to be set up.

• 🔋 Check the polarity of the batteries (frequent error!).
• 🔄 Reset the scales by pressing the reset button (a small hole next to the battery compartment - use a paper clip).
• 📱 Make sure the batteries are new and not discharged (even if they are made from a kit).

Batteries are installed correctly (polarity!)

The screen shows the Mi logo

The scales are on a flat surface.

Bluetooth on your phone is on-->

Important nuance: if you see a symbol on the scale screen BT, This means that they have already been connected to another device before, in which case you need to reset (instruction in section 5).

3. Connect to the Mi Fit app: a step-by-step guide

The main weights app is Mi Fit (formerly Mi Health), which is where data synchronization, profile customization, and measurement analytics are done. If you try to connect scales through Mi Home, you won't get anywhere -- this app is for a smart home and doesn't support fitness devices!

Follow these instructions for successful connection:

1. Open the Mi Fit app and log in (if you haven't already). Use the same Xiaomi account as you did on your phone.
2. Click on the profile icon (in the upper right corner) and select Add Device.
3. In the category list, select Libra, then find the Xiaomi Body Composition Scale 2 (or XMTZC05HM).
4. Press Connect and follow the instructions on the screen. The scales should flash with a blue LED, which means they are ready to pair.
5. Stand on the scale with bare feet (this is important for the first measurement!) After 5-10 seconds, a request for confirmation of connection will appear on the phone screen.
6. Confirm the pairing and wait for the synchronization to complete.

If the scales are not connected:

• ❌ Error: “Device not found" → Make sure that Bluetooth is on and the scales are no further than 1 meter from the phone.
• ❌ Error: “Unable to connect" → Remove the scales from the list of Bluetooth devices of the phone (in the OS settings) and try again.
• ❌ Libra shows -- They don't react → Reset them to factory settings (see Section 5).

Once the application is successfully connected, it will prompt you to create a user profile, and here it is important to enter accurate data:

• 👤 Gender (male / female) - affects the algorithms for calculating fat mass.
• 📏 Growth to within a centimeter (an error of 2-3 cm distorts the readings by 5-10%).
• 🎂 Age - the more accurate, the more correct will be the metrics of metabolism.
• 🏋️ Target weight (optional, but useful for tracking progress).

Configure additional parameters for accurate measurements

The basic connection is not enough for maximum accuracy. Xiaomi Body Composition 2 scales have several hidden settings that allow you to improve the quality of measurements. Most users do not use them, but the difference in readings can be as much as 15-20%!

Calibration of the scales

Even new scales can give an error to the ±0.3 kg to eliminate it:

1. Stand on the scale and wait for a stable reading.
2. Remember or write down the weight.
3. Take an object with a known weight (such as a weight of 5 kg or a bag of sugar of 1 kg) and place it on a scale.
4. If readings differ by more than 50g, perform the manual calibration: Press and hold the button on the scales for 5 seconds. → flashing → put a weight on → wait for the preservation.

2. Adjustment of the athlete's mode

If you exercise regularly, turn this mode on in Mi Fit:

1. Open the device profile in the application.
2. Go to the Weights Settings → Athlete regime.
3. Choose the type of activity (strength training, cardio, crossfit, etc.).

This will change the algorithms for calculating muscle mass and water levels in the body.

3. Synchronization with other services

To automatically transfer data from the scales to Google Fit or Apple Health:

1. In Mi Fit, go to Profile → Settings → Data Synchronization.
2. Select the right service and log in.
3. Set the synchronization frequency (recommended automatically).

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Calibrating the scales and adjusting the athlete's mode are mandatory steps for those who are serious about body composition, without which the measurement error can reach 10-15%!

5. Resetting settings and error elimination

If the scales start to glittle -- they show incorrect data, they don't turn on or sync -- don't rush to bring them to the service. In 90% of cases, a full factory reset helps. Here's how to do it correctly:

Soft reset (keeps the measurement history):

1. Make sure the scales are on (on the 0.0 screen).
2. Press and hold the button on the back (near the battery compartment) for 3 seconds.
3. The scales will reset and show the Mi logo.

Hard reset (removes all data):

1. Turn off the scales (it is enough to remove the batteries for 10 seconds).
2. Put the batteries back in.
3. Press and hold the reset button for 10 seconds until the screen flashes red.
4. The scales will be reset to the factory settings and will be ready for a new setup.

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After a hard reset, remember to recalibrate the scales (see section 4) – this will eliminate possible errors caused by the failure.

Deciphering errors on the scale screen:

• ❌ Lo is a low battery charge. Replace them even if they're new (maybe marriage).
• ❌ -- — the scales are not calibrated or there has been a measurement error.
• ❌ Err is a critical sensor error. Try resetting the scales. If it doesn't work, contact the service.
• ❌ BT — The scales are connected to another device. Reset them and reconnect them.

⚠️ Warning: If after resetting the scales stopped turning on at all (the screen is not responding), check the contacts of the batteries - they could be oxidized.

Optimization of measurements: how to obtain the most accurate data

Even a perfectly tuned scale can show inaccurate data if you don't follow the rules of measurement.

1. Time of day.

Weight loss is best done on an empty stomach in the morning after going to the toilet, and during the day, weight can fluctuate by 1-2 kg due to food and water, and if you're measuring at different times, do it at the same time for comparability.

Conditions for measurements

• 🚿 Do not weigh yourself immediately after showering - wet skin distorts bioimpedance analysis.
• 🏃 Do not measure weight immediately after exercise (wait 2-3 hours).
• ☕ Avoid measurements after heavy drinking or eating (wait 1-2 hours).

Position on the scales

Stand strictly in the center, spreading the weight evenly on both legs. Don't lean on the wall or furniture. Legs should be dry and clean (sweat or foot cream distorts readings).

Frequency of measurements

To track the dynamics, you need to weigh yourself 1 time a day (morning). More frequent measurements will not give new information, but can cause psychological discomfort due to natural weight fluctuations.

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The accuracy of the bioimpedance test depends on the hydration of the body, and if you drink a lot of water before measuring, your fat and muscle levels will be underestimated and your water levels will be overestimated.

7.Integration with other devices and services

Xiaomi Body Composition 2 scales can be linked not only to Mi Fit, but also to other gadgets and platforms, which will allow you to collect all the health data in one place.

1. synchronization with Mi Band or Amazfit

If you have a Xiaomi fitness bracelet, you can combine the data:

1. Open Mi Fit and go to the device profile.
2. Click Link to other devices.
3. Choose your bracelet from the list.

Now the data from the scales and the bracelet will be displayed together in the same graph.

2.Export data to Google Fit or Apple Health

To automatically transmit data:

1. In Mi Fit, go to Profile → Settings → Data Synchronization.
2. Select the right service and log in.
3. Set up synchronization settings (for example, you can turn off weight transfer, leaving only data on fat and muscle).

3.Using with Yandex Alice or Google Assistant

You can voice-request the latest measurements:

• For Alice: Say “Alice, show me my last weight” (you need to connect Mi Fit to your Yandex account).
• For Google Assistant, “OK Google, what percentage of fat do I have?”

⚠️ Note: When synchronized with Apple Health, body composition data (fat, muscle, water) may not be fully transmitted due to Apple restrictions.

8. Frequently Asked Questions (FAQ)