The Xiaomi Mi Smart Scale 2 has become a popular weight and body composition gadget thanks to its precision measurements and integration with the Mi Fit app. However, even such a simple device requires proper maintenance — especially when it comes to power supply. Many users are faced with the question: what batteries are needed for these scales to work steadily and without failures?
In this article, we will discuss not only the official recommendations of the manufacturer, but also alternative battery options that are suitable for the Mi Smart Scale 2. You will learn how to choose power cells according to the specifications, where to buy them, how to replace them, and what errors can occur when using inappropriate batteries.
If your scales start showing incorrect data, suddenly switch off or give out a connection error, the problem may be in the batteries, then you will find step-by-step instructions and tips to help avoid typical problems and extend the life of the device.
Xiaomi Requirements: Which Batteries Are Right for the Mi Smart Scale 2
Xiaomi manufacturer clearly indicates in the documentation for the weights of the Mi Smart Scale 2 that they require 4 batteries of the type. AAA (LR03). But it’s not the only criterion, it’s also important:
- 🔋 Voltage: Each battery must produce 1.5 V, a total of 6 V for the entire unit.
- 🔄 Type of chemical composition: alkaline or lithium elements are recommended.
- ⚡ Capacity: Minimum 1000 mAh for alkaline and 1200 mAh for lithium.
- 🏷️ Xiaomi doesn’t insist on a specific brand, but advises avoiding cheap no-name batteries.
It is important to understand that the Mi Smart Scale 2 is sensitive to voltage stability. If the batteries are discharged unevenly or of poor quality, the scales can:
- 📉 Inaccurate readings (e.g., “jumping” weight).
- 🔌 Do not switch on or spontaneously disconnect.
- 📱 Lose communication with the Mi Fit app.
The manual also mentions that you can’t use rechargeable batteries — their voltage (1.2 V) is not enough to properly work the scales, one of the most common myths: many users try to save money by installing Ni-MH batteries, but as a result, they get malfunctions.
Alkaline vs. Lithium Batteries: What’s Best for Mi Smart Scale 2
Choosing between alkaline and lithium batteries is key to the longevity of scales. Let's compare them in terms of the main parameters:
| Characteristics | Alkaline (Alkaline) | Lithium (Lithium) |
|---|---|---|
| Term of service | 6–12 months | 12-24 months |
| Stability of voltage | It's going down. | Maintains high level until end of charge |
| Price (for 4 pcs) | 100–300 ₽ | 300–600 ₽ |
| Temperature resistance | Working with −20°C…+50°C | Working with −40°C…+60°C |
| Risk of leakage | High at deep discharge | Virtually absent |
At first glance, lithium batteries win in all respects, but there are nuances:
- 💰 They are more expensive, but pay off due to the long service life - especially if the scales are rarely used.
- ⚖️ Alkaline batteries are cheaper, but can leak if the scales are not used for a long time (for example, during vacations).
- ❄️ If the scales are in a cold room (for example, in a bathroom without heating), lithium batteries are preferable.
Our advice is that if you weigh yourself daily, take lithium batteries, they will last longer without losing accuracy, and high-quality alkaline batteries (such as Duracell or Energizer) will also be suitable for rare use.
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Before buying, check the production date on the packaging! batteries Released more than a year ago could lose up to 20% charge even in sealed packaging.
What batteries should not be used in Mi Smart Scale 2
Not all batteries are suitable for Xiaomi smart scales, and here is a list of prohibited options that can bring the device down:
- 🔋 Zinc-carbon: Discharge quickly and can leak, damaging the contacts.
- 🔄 Battery (Ni-MH, Ni-Cd): 1.2 V instead of the required 1.5 V.
- 📉 Discharged or used: may cause calibration errors.
- 🔥 Damaged or bloated: the risk of short circuit.
It's especially dangerous to use batteries -- even if they're new. 2 designed for stable voltage 6 V (4 × 1.5 Batteries are issued 4.8 V (4 × 1.2 B), which leads to:
- 📵 Loss of communication with the annex.
- 🔄 Self-resetting.
- 📊 Inaccurate readings (error before) ±500g).
⚠️ Attention, if you've already installed the batteries and the scales stopped working, immediately remove them.
Also avoid batteries with an expired shelf life (usually 5-7 years from the date of manufacture). Old cells lose capacity and can leak, oxidizing contacts inside the compartment. If you notice rust or white coating on the batteries, do not use them!
How to replace batteries in Mi Smart Scale 2
Replacing the batteries in Xiaomi scales is a simple procedure, but there are a few nuances that will help to avoid errors.
- Preparation: 📱 Turn off the scales from the Mi Fit app (if connected). 🧹 Turn the scales over and place them on a soft surface (such as a towel) to avoid scratching the screen.
- Opening of the bay: 🔧 Click on the latch at the bottom of the scales (near the inscription) BATTERY). 🖐️ Pull the lid on yourself - it should open easily.
- Removing old batteries: ⚠️ If the batteries leak, put on gloves and carefully remove them with a wooden stick. 🧻 Wipe the compartment with a dry wipe (for corrosion, use a cotton swab dipped in vinegar).
- Installation of new batteries: ⚡ Insert elements strictly polarity (plus to plus, minus to minus). 🔄 Make sure all 4 batteries are of the same brand and grade of charge.
Check:
- 📱 Turn on the scales and wait for the calibration (0.0 will appear on the screen).
- 🔄 Sync with the Mi Fit app again if required.
☑️ Checklist before replacing batteries
If after the weight change is not included:
- 🔋 Check if the batteries are properly installed (sometimes the contacts do not touch due to deformation of the springs).
- 🔌 Try resetting the scales by pressing and holding the on button (if any).
- 📱 Remove the device from Mi Fit and add it again.
⚠️ Attention! Never use metal objects to retrieve batteries, it can close contacts. If the battery is jammed, gently swing it with a plastic card.
Where to buy batteries for Mi Smart Scale 2: proven options
You can buy high-quality smart scale batteries in a number of places, and we've put together proven options based on price/quality ratios.
| Place of purchase | Recommended brands | Average price (4 units) | Pluses | Cons |
|---|---|---|---|---|
| Offline stores (M.Video, Eldorado) | Duracell, Energizer | 250–400 ₽ | Can you check the date of production? | Prices are higher than online |
| Supermarkets (Pyatochka, Magnet) | GP, Kodak | 150–250 ₽ | Convenient to buy with products | Limited choice, risk of counterfeiting |
| Online (Wildberries, Ozon) | Panasonic, Varta | 180–350 ₽ | Wide range, stocks | We're waiting for delivery. |
| Specialized shops (Accumulator.ru) | Energizer Ultimate Lithium | 400–600 ₽ | Quality assurance, consultation | More expensive than in the mass market. |
Our advice:
- 🛒 For alkaline batteries, the best choice is Duracell Turbo or Energizer Max. They leak less and hold a charge longer.
- 🔋 For lithium – Energizer Ultimate Lithium (the most durable, but also the most expensive).
- ⚠️ Avoid batteries without labeling or with a suspiciously low price (e.g. 50) ₽ 4 grand is almost always a fake.
If you're buying online, look at the reviews about the seller. Wildberries and Ozon are often known forgeries.
- 📦 The packaging must be whole, without damage.
- 📅 Date of production - not older than 1 year.
- 🔍 Batteries should have a brand logo and markings AAA.
How to distinguish the original Duracell batteries from a fake?
Frequent problems after replacing batteries and how to fix them
Even if you have installed new batteries, the Mi Smart Scale 2 scale may not work properly.
| Problem. | Possible cause | Decision |
|---|---|---|
| Libras not included | Improper polarity or oxidized contacts | Check the installation of batteries, clean the contacts with alcohol |
| Indications "jump" | Different battery charge or vibration | Install a new set of batteries of one brand, put the scales on a flat surface |
| Not synchronized with Mi Fit | Resetting settings after replacing batteries | Remove the device from the application and add again |
| They show a knowingly incorrect weight. | Calibration required | Stand on the scale and hold for 5 seconds – automatic calibration will start |
If the scales after battery replacement show an Err error, it could mean:
- 🔋 One of the batteries is faulty or discharged.
- 🔌 Contacts are contaminated (wipe them with a swallow or alcohol).
- 📱 The firmware of the scales is lost (try resetting the settings through Mi Fit).
To reset the settings:
- Hold the power button (if any) for 10 seconds.
- Or remove the scales from Mi Fit and add them again.
⚠️ If after all the manipulations, the scales still do not work, the problem may be in the electronic board. In this case, contact the Xiaomi service center - self-repair without skills can lead to final breakdown.
Tips for extending battery life in Mi Smart Scale 2
To make batteries in smart scales last longer, follow these recommendations:
- 🔌 Turn off the scales from Mi Fit if you don’t use them for a long time (for example, while on vacation.
Also, pay attention to the quality of the surface on which the scales are standing, if it is uneven or soft (such as a carpet), the device will spend additional energy to stabilize the readings, the optimal option is a flat hard surface (tile, laminate).
If you use scales intensively (multiple times a day), consider buying a 6V rechargeable power supply (such as from an old router).
- ⚠️ This is a guarantee (if it is still valid).
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The use of high-quality alkaline or lithium batteries and compliance with the rules of operation can increase their service life in the Mi Smart Scale 2 scales up to 2 years.