What batteries are in the Xiaomi 2 scales – a complete guide to choosing and replacing

Introduction: Why choosing the right batteries is important for the accuracy of weights

Xiaomi Mi Body Composition Scale 2 has become one of the most popular home health monitoring gadgets, not only measuring weight, but also analyzing body composition — body fat percentage, muscle mass, water level, even bone density. But many users are faced with a problem: the scales suddenly stop turning on or show incorrect data, 80% of the time the reason lies in the discharged or inappropriate batteries.

In this article, we will discuss what kind of batteries are needed for Xiaomi Scale 2, how to replace them correctly so as not to damage the device, and what mistakes owners most often make. You will also learn how to extend the life of batteries and what to do if the scales do not respond even to new elements. Information is relevant for all versions of the second version of the scales, including models with the indexes XMSH07HM and XMSH08HM.

Important: If you use scales with the Mi Fit or Zepp Life app, the wrong choice of batteries can lead not only to failures in measurements, but also to loss of sync with the phone.

What batteries are needed for Xiaomi Scale 2

According to the manufacturer’s technical documentation, the Xiaomi Mi Body Composition Scale 2 scales are powered by four AAA batteries (also known as “little finger” or “R03”), but not all of the power cells in this form factor will work equally well.

• 🔋 Type: Alkaline or lithium batteries only, Zinc-carbon is not recommended due to short lifespan and leakage risk.
• 📏 Voltage: Each battery must produce 1.5 V. The total voltage for the device is 6 V.
• 🏷️ Brand: preference is given to proven manufacturers - Duracell, Energizer, GP Chinese no-name batteries can run out quickly.
• ⚡ Capacity: optimally - from 1000 mAh for alkaline and from 1200 mAh for lithium.

The battery packs are not supplied with weights, so you need to buy them separately. The manufacturer claims that with moderate use (1-2 weighings per day), one set lasts 6-12 months, but in practice this period depends on the quality of the elements and storage conditions.

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If you use scales infrequently (e.g. once a week), remove the batteries for downtime, which will prevent them from self-discharging and extend their lifespan by 20-30%.

Important: Xiaomi does not recommend using rechargeable (battery) batteries of the AAA type. They have a lower voltage (1.2 V instead of 1.5 V), which can lead to unstable sensor operation or complete failure of the device. If you still want to use batteries, choose models labeled HR03 (nickel-metal hydride) and a voltage of at least 1.35 V.

Battery types comparison: which is better for Xiaomi Scale 2

Not all AAA batteries are equally useful for smart scales, and here is a comparison table of the most common types with their pros and cons in the context of using the Xiaomi Mi Body Composition Scale 2.

For most users, alkaline batteries will be the best balance of price and quality. Lithium batteries are worth choosing if you weigh several times a day or store the scales in an unheated room (for example, in the bathroom in winter). Salt batteries are better avoided - they will not only sit quickly, but can damage the balance contacts when leaking.

Step-by-step: how to replace batteries in Xiaomi Scale 2

Replacing the batteries in Xiaomi’s smart scales is a simple procedure, but it requires care. Mistakes can damage the contacts or calibrate the sensors.

1. Preparation: Turn the scales upside down. On the bottom panel, you'll see the battery lid, which is fixed to the latch.
2. Opening compartment: Carefully slap the lid with a flat object (such as a plastic card or mediator) on the side where there is a small groove. Do not use metal tools - they can scratch the body.
3. Removing old batteries: Take out all four elements. Notice the polarity -- there's a marking in the compartment"+" and"−".
4. Installation of new batteries: Insert the elements according to polarity. Start with the extreme batteries to avoid skewing.
5. Closing the lid: Make sure all contacts are in contact with the batteries, then snap the lid until the characteristic click.

After the battery is replaced, the scales should automatically turn on. If this does not happen, just press the platform with your foot, this will activate the sensors. If the scales are still unresponsive, check:

• 🔄 Proper installation of batteries (possibly one turned over).
• 🔌 Quality of contacts – sometimes oxidation of metal plates interferes with the supply of current.
• 📱 Sync with the app: sometimes after replacing the batteries, a reconnection via Bluetooth is required.

Common mistakes when replacing batteries and how to avoid them

Even a simple procedure like replacing batteries can be problematic if mistakes are made, and the most common ones are the ways to prevent them:

⚠️ Warning: Never mix batteries of different types (e.g. alkaline and lithium) or with different levels of charge.This can cause cells to overheat and damage to electronic components of the scales.

• 🔋 Use of discharged batteries: If you have taken the items from another device where they have already run out of life, they may not provide enough voltage for the Xiaomi Scale 2.
• 🧲 Ignoring Polarity: The Wrong Location"+" and"−" It can short-circuit, at best the scales won't turn on, at worst it'll burn the fuse.
• 💦 Moisture intake: If you store scales in the bathroom, condensate can oxidize contacts. Periodically wipe the battery compartment with a dry wipe.
• 🔄 Frequent battery replacement: If the cells sit down faster than 2 months, check the scales for current leakage (possibly damaged one of the sensors).

Another common problem is calibration error after battery replacement, and the scales may show the wrong weight (e.g., overweight or underweight by 1-2 kg) to reset the calibration:

1. Turn on the scales and wait for zeros to appear on the display.
2. Press the platform and hold your foot for 5 seconds.
3. Take off your leg and wait until the scales are zeroed again.
4. Repeat the weighting – the data must be accurate.

If the scales show an error of "Err" or "Lo" after replacing the batteries, this means that the voltage on the contacts is insufficient. Try to clean the contacts in the battery compartment with an alcohol wipe - often the oxidation of the metal interferes with normal operation.

How to extend the battery life in Xiaomi Scale 2

The average battery life in Xiaomi’s smart scales is 6-12 months, but if used properly, it can be extended to 18 months.

• 🔌 Turn off the scales: If you don't use the device for longer than a week, remove the batteries.
• 🌡️ Store in a dry place: Humidity speeds up corrosion of contacts. avoid storing scales in the bathroom without airing.
• 📵 Don't leave the scales on: After weighing, wait until the display goes out (usually 10-15 seconds). If you leave the scales under load, they will continue to consume energy.
• 🔋 Use batteries of the same brand and batch: Elements from different packages may have different capacity, which will lead to uneven discharge.
• ☀️ Avoid direct sunlight: Heating accelerates electrolyte degradation in batteries, especially in alkaline.

If you use scales daily, consider buying lithium batteries. They are more expensive, but their capacity and voltage stability justify the investment. For example, Energizer Ultimate Lithium or Panasonic Evolta last 1.5-2 times longer than standard alkaline batteries.

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The most effective way to extend the life of batteries is to remove them from the scales for a long period of downtime (for example, on a business trip or vacation).

Another useful life hack: if you notice that the scales have started to "glutch" (for example, turn on for a long time or show unstable data), do not rush to change all the batteries. Sometimes it is enough to replace only one discharged one - the rest can still serve. To find the "weak link", check the voltage of each battery with a multimeter (it should be at least 1.3 V).

What to do if Xiaomi 2 scales do not work after replacing batteries

The situation where the scales are not turned on even after installing new batteries, occurs in 5-10% of cases, the causes can be different from the banal wrong contact to serious malfunctions of the board.

1. Check polarity: Make sure all batteries are installed correctly (+ ce +, − ce −). An inverted element can block the current supply.
2. Clear the contacts: Oxidation or dirt on the metal plates of the compartment may interfere with the connection. Wipe them with a cotton swab soaked in alcohol.
3. Check the batteries with a multimeter: Even new cells can be defective. Each battery must have a voltage of 1.5-1.6 V.
4. Reset settings: Hold the power button (if any) for 10-15 seconds. For models without a button, leave the scales without batteries for a day.
5. Check the fuse: In rare cases, a power surge can burn the fuse on the board.This requires repair at a service center.

⚠️ Note: If after replacing the batteries, the scales show an error of "Err 2" or "Err 3", this may indicate damage to the weight sensors.

If the scales are enabled but not synced with the Mi Fit or Zepp Life app, follow the following steps:

1. Remove the device from the list of connected in the application.
2. Reboot your smartphone.
3. Turn on Bluetooth and re-add the scales via Add Device.
4. If sync is not restored, reset the scales to factory settings (usually this is done by holding the on button).

As a last resort, try using a scale without an app — the basic functions (weight measurement) will work without a phone connection, but body composition data (fat percentage, muscle, etc.) are only available when synchronized.

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