Xiaomi Mi Smart Scale 2 has become a popular gadget for weight and body composition control thanks to accurate measurements and integration with the Mi Fit app. However, even such a simple device requires proper maintenance - especially when it comes to replacing batteries. Many users are faced with the question: what batteries are needed for the Mi Smart Scale 2, how to install them correctly and can you save on consumables without compromising the operation of the device?
In this article, we will look at all the nuances associated with the power of scales, from official manufacturer recommendations to life hacks on extending the life of batteries, you will learn what types of batteries are compatible with the model, how to avoid common replacement errors and what to do if the scales stopped turning on after installing new batteries, and we will analyze alternative options (batteries, rechargeable batteries) and give recommendations for choosing brands.
Importantly, the wrong choice of batteries can lead not only to quick discharge, but also to malfunction of sensors or even damage to the electronic board. So approach the issue responsibly - especially if you use scales for medical purposes or strict control of fitness programs.
Xiaomi: What batteries are needed for the Mi Smart Scale 2
Xiaomi manufacturer clearly indicates in the instructions for the Mi Smart Scale 2, that the device is operating from 4 battery-type AAA (LR03). These are standard "little" voltage power cells 1.5 The total supply voltage of the scales is 6 V (4 × 1.5 V).
Mi Smart Scale 2 does not support other types of batteries, such as:
- 🔋 AA (LR6) — They are too large and physically incapacitated in the room;
- 🔋 AAA (LR03) 1.2V (nickel-metal hydride) – can work, but reduce the accuracy of measurements;
- 🔋 Flat batteries (CR2032 etc. – incompatible in size and voltage;
- 🔋 Lithium-ion batteries 14500 – have a voltage of 3.7 V, which exceeds the permissible and can disable the scales.
Complete with weights, batteries don't come - they need to be bought separately. Xiaomi recommends using alkaline (alkaline) batteries from proven brands like Duracell, Energizer or Panasonic.This is due to their stable voltage and long lifespan.
⚠️ Warning: Using batteries with an expired shelf life (even new ones) can lead to leakage of the electrolyte and damage to the balance contacts!
How to replace batteries in Xiaomi Mi Smart Scale 2: Step-by-step instructions
Replacing the batteries in the Mi Smart Scale 2 takes no more than 2-3 minutes, but requires care.
- Turn the scales over and find the battery compartment at the bottom of the case, and it's covered with a plastic lid.
- Open the lid: put a nail or a flat object (like a plastic card) in the groove. Don't use metal tools, they can scratch the body.
- Remove old batteries by pressing them slightly from below. Notice the polarity. + and − compartment).
- Install new batteries with polarity. Start with the extremes, then insert the middle ones.
- Close the lid before you click. Make sure it fits tightly, otherwise the scales may show incorrect data due to vibrations.
After the weight change, the weights should automatically turn on. If this does not happen, press the platform with your foot - this will activate the weight sensor and start the device.
Prepare 4 new batteries AAA (LR03) brand
Check the polarity (+/-) scale-block
Make sure the contacts in the compartment are clean (no oxidation)
Do not touch the internal weight sensors.-->
If after weight replacement, you do not turn on or show an error, check:
- 🔄 Battery installation (confused polarity is a common mistake);
- 🔋 Quality of contacts (oxidation or contamination can be cleaned with a cotton swab dipped in alcohol);
- 📱 The status of the scales in the Mi Fit application (sometimes a reconnection is required).
Battery life: how much work and how to extend their life
The average battery life in the Mi Smart Scale 2 depends on several factors:
| Type of battery | Average service life | Notes |
|---|---|---|
| Alkaline (alkaline) | 6–12 months | The best option in terms of price / quality ratio |
| Lithium (LR03) | 12–18 months | Expensive, but work longer and more stable at low temperatures |
| Nickel-metal hydride (Ni-MH, 1.2 V) | 3–6 months | Can cause measurement errors due to low voltage |
| Salt (zinc carbon) | 1-3 months | Not recommended – they are quickly discharged and can leak |
In practice, batteries can last longer or less than the specified period depending on:
- 📊 Frequency of use: if the scales are turned on 1-2 times a day, the charge is consumed more slowly;
- 🌡️ Storage conditions: High humidity or temperature reduces service life;
- 🔌 Contact quality: oxidized or contaminated contacts increase resistance and discharge.
Critical: if the scales have not been used for a long time (more than 3 months), the batteries can run out even when turned off due to parasitic currents in the circuit. To avoid this, remove the batteries during prolonged downtime.
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If the batteries start to run out quickly, check the scales for moisture inside the case. Condensation can form when stored in the bathroom - move the device to a dry place.
Can I use rechargeable batteries or batteries?
Many users are wondering whether it is possible to replace disposable batteries with batteries of the type AAA (for example, Eneloop or GP Rechargeable? technically possible, but there are a few important nuances:
The advantages of rechargeable batteries:
- 💰 Savings: One set of batteries can be recharged hundreds of times;
- 🌱 Environmentally friendly: less waste;
- 🔋 Stable voltage: Lithium-ion batteries hold charge longer than salt.
Cons and risks:
- ⚠️ Low voltage: Most Ni-MH batteries have a voltage of 1.2 V instead of 1.5 V, which can lead to inaccurate measurements;
- ⚠️ Self-discharge: batteries lose power even without use (up to 10-15% per month);
- ⚠️ Overheating: Cheap batteries can heat up when charging, which is dangerous for the electronics of scales.
If you do decide to use batteries, choose lithium-ion models with a voltage of 1.5 V, for example:
- 🔋 Kentli 1.5V AAA (Lithium, without memory effect);
- 🔋 EBL AAA 1.5V (low-discharge).
⚠️ Warning: Never use 14500 type batteries (lithium-ion, 3.7V) – they have a different voltage and can burn the electronic scale board!
Disposable alkaline (Duracell, Energizer)
Lithium (Energizer Ultimate Lithium)
Rechargeable Ni-MH (Eneloop, GP)
Rechargeable Li-ion 1.5 V (Kentli, EBL)
I don't know/no follow.-->
What if the scales do not work after replacing the batteries?
Mi Smart Scale 2 is not so rare when new batteries are installed, and the causes can range from a simple installation error to serious malfunctions.
1. Check polarity and contacts
Make sure the batteries are installed correctly (+) plus, minus (−) Also check the contacts in the compartment, which must be clean and not bent, and the oxidation can be removed with a weasel or alcohol.
2.Reset the scales
Sometimes the electronic board freezes. To reset it, remove the batteries for 30 seconds, then set it back. If the scales still don't respond, try pressing the platform with force, which can wake the sensor.
3. Check the quality of the batteries
Even new batteries can be discharged or defective, try replacing them with another set, and if the scales work, the problem was the batteries.
4.Reset settings via Mi Fit
If the scales are included but not synchronized with the application:
- Open Mi Fit;
- Go to Profile. → Devices → Mi Smart Scale 2;
- Press Remove the device;
- Then add the scales again through Add the device.
Diagnostics of malfunctions
If nothing has worked, the following problems may occur:
- 🔧 Weight sensor damaged (required repair);
- 🔧 Wires are cut off from the board (often after a fall);
- 🔧 Electronic board is out of order (replacement is needed).
What to do if the batteries leak?
Review of the best batteries for Xiaomi Mi Smart Scale 2: ranking 2026
Battery selection is not as easy as it seems, because cheap ones can run out or leak quickly, and expensive brands don't always live up to their price, and we tested several popular models and ranked them by price/quality ratio:
| Brand and model | Type | Average service life | Pluses | Cons |
|---|---|---|---|---|
| Duracell Turbo Max AAA | alkaline | 10-12 months | Stable voltage, protection against leakage | High price. |
| Energizer Ultimate Lithium AAA | lithium | 18+ months | Works with −40°C, light weight | Very expensive. |
| GP Super Alkaline AAA | alkaline | 8-10 months | Good Price/Quality Relationship | There are forgeries. |
| Panasonic Evolta AAA | alkaline | 9-11 months | Long shelf life (10 years) | High price for packaging |
| IKEA Alkalisk AAA | alkaline | 6-8 months | Low price, sold in a set of 10 pcs. | They discharge faster under load. |
For most users, the best choice is the Duracell Turbo Max or the Duracell Turbo Max. GP Super Alkaline — they provide stable weights and rarely fail. If you're willing to overpay for maximum life, look for the Lithium Energizer Ultimate Lithium.
Tip: buy batteries in trusted stores (for example, Svyaznoy, M. Video, Ozon with a high rating of the seller) to avoid counterfeiting. In markets or in small stalls, the risk of running into low-quality goods is much higher.
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Lithium batteries (such as Energizer Ultimate Lithium) are ideal for the Mi Smart Scale 2 if you use scales rarely or store them in an unheated room. They do not lose charge at low temperatures and last 2-3 times longer than alkaline.
Frequent mistakes in choosing and replacing batteries: how to avoid them
Even experienced users sometimes make mistakes that cause the scales to break or the batteries to run out quickly, and here are the most common ones:
1. Use of different types of batteries or brands
Never mix in one device:
- 🔋 Alkaline and lithium;
- 🔋 Old and new;
- 🔋 Different manufacturers (for example, Duracell and Nettime brand).
This results in uneven discharge and can damage the electronic board.
2. Storage of scales in a wet room
Many people put scales in the bathroom without thinking about the consequences. Humidity speeds up the corrosion of contacts and shortens the life of batteries. The optimal storage location is a bedroom or a corridor.
Purchase of "reserve" batteries
Batteries have an expiration date (usually 5-10 years) If you bought them in bulk and stored them for several years, they may have run out before they were put into the scale. Check the date of production on the package.
4. Ignoring low-charge signals
When the batteries start to run out, the scales may show inaccurate data or shut down during measurements. Don't wait for full discharge - replace the batteries at the first sign of unstable operation.
5. Use of batteries without voltage check
As mentioned, most Ni-MH batteries lack the voltage to run the Mi Smart Scale 2 properly. If you still want to use rechargeable batteries, choose 1.5V models.
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If you often forget to turn off the scales, put a little reminder on the body: "After using the platform to turn off," which will extend the life of batteries by 20-30%.