What batteries are suitable for Xiaomi Mi Body Composition 2: full analysis + replacement

Why choosing the right battery is important for measurement accuracy

The Xiaomi Mi Body Composition 2 has become a popular body composition control gadget, measuring not only weight, but also fat percentage, muscle mass, water level, and even bone density. However, many users face a problem: the device suddenly turns off, shows incorrect data, or completely stops turning on, 90% of the time due to discharged or inappropriate batteries.

The manufacturer says that the scales should last up to 12 months on a single set of batteries, but in practice, the life of the scale depends on the intensity of use, the quality of the batteries and even storage conditions. For example, if you store the scales in a high-humidity bathroom, the batteries can run 2-3 times faster.

In this article, we will discuss:

• 🔋 What batteries are needed for Mi Body Composition 2 according to official requirements (and why not all of them) AAA fit)
• 📊 Brand comparison: which batteries hold the charge longer

Xiaomi: What batteries are needed for Mi Body Composition 2

In the instructions for the weights Xiaomi Mi Body Composition 2 (model) XMTZC05HM) It is clearly stated that the device operates from 4 batteries of the type. AAA (LR03). But not all AAA-The manufacturer recommends using batteries with a voltage of 1.5 V and a capacity of at least 1000 mAh?

The fact is that the scales are equipped with high-precision strain gauges and a bioimpedance analyzer that require stable power supply. If the battery voltage sags below 1.3 V, the device can:

• 📉 Inaccurate weight (incorrect weight) ±0.5 kg)
• ⚡ Turn off during measurement
• 🔄 Reset your sync settings with Mi Fit
• 🚫 Refuse to turn on at low charge

In addition, the Mi Body Composition 2 scales do not support rechargeable batteries. AAA. This is because nickel-metal hydride (Ni-MH) or lithium-ion (Li-ion) batteries have a lower voltage (1.2 V instead of 1.5 V), which leads to unstable operation of the device. The only exceptions are specialised batteries with high voltage (for example, Eneloop Pro), but their use does not guarantee the correct operation of sensors.

💡

If you buy batteries in stock, store them in their original packaging at room temperature. The refrigerator (as some advise) does not prolong the life of the refrigerator, but on the contrary - can cause condensation and corrosion.

Alkaline vs Lithium Batteries: What’s Best for Mi Body Composition 2

There are two main types of batteries on the market. AAA, The best ones are alkaline and lithium scales?

Alkaline batteries (e.g. Duracell Basic, Energizer Max) are the most common option, cheaper than lithium batteries, but have a number of drawbacks:

• 🔋 Term of service: ~6–9 months with daily use
• ⚡ The voltage subsides gradually, which can affect the accuracy of measurements.
• 🌡️ Sensitive to temperature changes (in the bathroom discharged faster)

Lithium batteries (e.g. Energizer Ultimate Lithium, Duracell Lithium) are more expensive, but justify the price:

• 🔋 Service life: up to 12-18 months
• ⚡ Stable voltage 1.5 V to full discharge
• 🌡️ They operate within the temperature range of -40°C +60°C
• 💧 They do not leak (important for wet rooms)

If you use scales daily and store them in the bathroom, lithium batteries will be the best choice. For rare use (1-2 times a week), high-quality alkaline batteries, for example, are sufficient, GP Super Alkaline.

⚠️ Warning: Never mix alkaline and lithium batteries in the same device! Different internal resistance can cause overheating and damage to the balance contacts.

How to replace batteries in Xiaomi Mi Body Composition 2

Replacing the batteries in the Mi Body Composition 2 scales takes no more than 2-3 minutes, but it is important to do it correctly so as not to damage the device.

1. Preparation: 🛑 Turn off the scales (if they are on) by pressing the power button. 🧹 Turn the device over to a flat surface (for example, a table). 🔍 Find the battery compartment – it is located at the bottom and closed with a lid.
2. Opening of the bay: 🔧 Carefully tuck the compartment cover with a flat screwdriver or coin (the slot for opening is marked with an arrow). ⚠️ Do not make excessive efforts - the lid is attached to the latches.

Battery replacement:

• 🗑️ Remove old batteries while observing polarity (+ and −).
• ⚡ Install new batteries, focusing on the marking in the compartment.
• 🔄 Close the lid before you click.

After the battery is replaced, the scales must automatically turn on.

• 🔄 Turn the device over and press the reset button (located next to the battery compartment).
• 📱 Reconnect the scales to the Mi Fit app (go to Profile) → Devices → Mi Body Composition 2 → Reconnect).

⚠️ Note: If after replacing the batteries, the scales show an error E1 or E2, This means a sensor problem. Try to remove the batteries for 10 minutes, then set them back. If the error persists, contact the service center.

Top.-5 The Xiaomi Mi Body Composition 2: price and service life comparison

We tested popular batteries. AAA Xiaomi smart scales and ratings on price/quality, all tests were conducted with daily use (2-3 measurements per day) in standard humidity conditions.

If you want maximum accuracy over the life of your car, choose Energizer Ultimate Lithium batteries. For a budget option, Duracell Turbo Max or Panasonic Evolta are suitable.

💡

Lithium batteries are worth the price if you use scales daily or store them in a wet room.

Frequent mistakes in choosing and replacing batteries: how to avoid them

Many users experience problems with the Mi Body Composition 2 scales due to seemingly trifles, and here are the most common mistakes and how to prevent them:

1. Use of batteries instead of batteries

As mentioned, the scales are not designed to run at 1.2 V, which is what Ni-MH batteries give you.

• 📉 Inaccurate readings (especially when measuring body composition).
• ⚡ Frequent spontaneous shutdowns.
• 🔋 Fast discharge (batteries sit down in 1-2 weeks).

2. Installation of batteries of different capacity or brand

If you are mixing Duracell and GP, One battery will run out faster than the other, which will cause the:

• 🔋 Uneven loading of elements.
• 💥 Risk of leakage (due to overheating of a stronger battery).

Fragile closure of the compartment cover

If the lid is not snapped to the end, the contacts may move away, which manifests itself as follows:

• 🔄 The scales are turned on only after a few presses.
• 📶 Loss of communication with the Mi Fit app.

4. Storage of spare batteries in the refrigerator

It's a myth that low temperatures don't prolong the life of alkaline batteries, but they can cause condensation when you return to a warm room.

• 🌡️ Temperature: +10°C +25°C.
• 💧 Humidity: not above 50%.
• 📦 Location: original packaging (without air access).

Libras are not included after replacing batteries: causes and solutions

If the Mi Body Composition 2 scales do not respond to the push of a button after installing the new batteries, do not panic. In most cases, the problem can be solved by yourself.

Reason 1: Wrong polarity

Check that all batteries are installed according to the label (+ and −) Even one battery inverted blocks the power supply.

Reason 2: Contact oxidation

If the old batteries leaked, the contacts could oxidize.

1. Wet the cotton swab in vinegar or alcohol.
2. Gently wipe the metal contacts in the compartment.
3. Let it dry for 5-10 minutes.

Reason 3: Resetting settings

Sometimes scales require rebooting after battery replacement.

1. Remove all batteries.
2. Press and hold the power button for 10 seconds.
3. Put the batteries back in.
4. Wait 1-2 minutes – the scales should turn on automatically.

Reason 4: Software Failure

If the scales are included but not synchronized with the Mi Fit:

1. Remove the device from the application (Profile) → Mi Body Composition 2 → Delete).
2. Reboot your smartphone.
3. Run Mi Fit and add the scales again (Add device) → Libra).

⚠️ Note: If after all manipulations the scales show an error E3, This indicates that the internal sensors are malfunctioning, and this requires professional repair.

FAQ: Frequent questions about batteries for Xiaomi Mi Body Composition 2