Xiaomi Mi Smart Scale 2 has become one of the most popular gadgets for home use due to measurement accuracy, synchronization with the Mi Fit application and affordable price. However, even such a simple device requires periodic maintenance - in particular, replacement of batteries. In this article, we will analyze which batteries are suitable for the Xiaomi Scale 2 scales, how to install them correctly, what errors users most often make, and give recommendations for extending the life of the device.
Many owners are faced with a problem: the scales suddenly stop turning on, show incorrect weight or refuse to sync with the smartphone. 90% of the time, the reason lies in the dead batteries. But not everyone knows that not all types of batteries are suitable for the Mi Smart Scale 2 - the wrong choice can lead to damage to the board or deterioration of the accuracy of measurements. We tested different options and gathered all the necessary information so that you can avoid typical errors.
What batteries Xiaomi recommends
According to the technical documentation, the Xiaomi Mi Smart Scale 2 scale (model XMTZC02HM) runs from 4 AAA batteries (LR03). These are standard finger cells with a voltage of 1.5 V each. The total power supply voltage of the device is 6 V (4 × 1.5 V). It is important to use batteries of the same type and brand - mixing different manufacturers or types (for example, alkaline and salt) can lead to unstable operation or even damage to electronic components.
The manufacturer recommends the use of alkaline batteries of well-known brands, such as:
- 🔋 Duracell (Plus or Procell series)
- 🔋 Energizer (Max line)
- 🔋 GP (Super Alkaline series)
- 🔋 Panasonic (Evolta models)
The use of AAA lithium batteries (e.g. Energizer Ultimate Lithium) is not recommended - despite a longer lifespan, their voltage (1.8 V) exceeds the nominal for weights, which can cause overheating of the chips. Also, batteries (Ni-MH or Ni-Cd) are not suitable, since their voltage (1.2 V) is not enough for stable operation of the device.
How to check that the batteries are gone: 5 obvious signs
Xiaomi Mi Smart Scale 2 scales do not have a battery charge indicator, so users have to focus on indirect signs.
- The scales are not turned on – when you press the platform, the screen remains empty, there is no sound signal.
- Incorrect readings – the weight is displayed with a large error (for example, ± 5 kg) or jumps when weighing again.
- Unintentional shutdown – the device turns off a few seconds after turning on.
- Synchronization problems – data is not transmitted to the Mi Fit app, the scales show the weight on the screen.
- Shimmering display – the characters on the screen are displayed fuzzy or flash.
If you see any of these signs, replace the batteries first. Don't try to "resuscitate" the cells, which can lead to electrolyte leakage and damage to the contacts inside the scales.
⚠️ Warning: If the scales are still not working after replacing the batteries, check the polarity of the installation of the elements"+" and-"may cause a short circuit to occur!
How to replace batteries in Xiaomi Mi Smart Scale 2
The process of replacing the batteries takes no more than 2-3 minutes, but requires care.
☑️ Preparation for battery replacement
- Open the battery compartment. Turn the scales over and find the bottom of the compartment cover, which is mounted with one screw under the cross screwdriver, and in some versions of the scales, the lid is fixed with a latch, which you can open with a coin, gently grazing it on the side.
- Remove the old batteries. Remove the batteries by paying attention to their location. Normally, the polarity is indicated on the scale body ("+" and "-").
- If there is oxidation or contamination on the metal contacts inside the compartment, wipe them with a cotton swab soaked in alcohol.
- Install new batteries. Insert the cells as marked polarity. Make sure all batteries fit tightly into the contacts.
- Close the lid. Twirl the screw or snap the lid until the characteristic click.
After the battery is replaced, the scales should automatically turn on. If this does not happen, click on the platform - the device should show zero and be ready to weigh.
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If the scales after replacing the batteries show an Err error, try resetting: hold the power button for 10 seconds, then restart the device.
Batteries: Which ones last longer?
The battery life of Xiaomi Mi Smart Scale 2 depends on the type, capacity and intensity of the scales, and we tested several popular options and compiled a comparative table:
| Type/Brand | Average service life (months) | Cost (per 4 pcs.), ₽ | Pluses | Cons |
|---|---|---|---|---|
| Duracell Plus AAA | 10–12 | 280–350 | Stable voltage, resistant to leakage | High price. |
| Energizer Max AAA | 9–11 | 250–320 | Long shelf life (up to 10 years) | They can flow at a deep discharge. |
| GP Super Alkaline | 8–10 | 180–220 | Optimal Price/Quality Relationship | It is slightly smaller than Duracell. |
| Space (salt) | 3–5 | 80–120 | Low price | They're discharged quickly, they're leaking. |
| Varta Longlife | 7–9 | 200–260 | Good resistance to temperature changes | Hard to find in small shops |
For maximum service life, we recommend choosing alkaline batteries marked Long Life or Extra Power. From budget options, the best price/quality ratio is possessed by the GP Super Alkaline.
⚠️ Warning: If you rarely use a scale (e.g. 1-2 times a month), remove the batteries during the downtime, which will prevent them from discharging and possible leakage of the electrolyte.
Frequent Battery Replacement Mistakes and How to Avoid Them
Even a simple process like replacing a battery can be a problem if you make mistakes, and here are the most common ones and ways to prevent them:
- 🔄 Confused polarity. Battery installation"+" k- and vice versa, result in short circuits. Always check the markings on the scale body!
- 🔋 Use batteries of varying degrees of charge. If one battery is new and the other is half-discharged, the scales will not work smoothly. Always replace all 4 cells at the same time.
- 💦 Moisture entering the battery compartment. If the scales are stored in the bathroom, condensation can cause contact corrosion.
- 🔌 Nickel metal hydride (Ni-MH) batteries have a voltage of 1.2 V, which is not enough for the balance to work properly. They may turn on, but the readings will be inaccurate.
- 🗑️ Ignoring electrolyte leaks. If the battery is running out, immediately clean the contacts with alcohol.
If the scales still do not work after replacing the batteries, check:
- The density of the battery compartment cover (sometimes the contacts do not reach the batteries).
- Integrity of spring contacts (they can be bent or oxidized).
- The presence of firmware updates in the Mi Fit application - sometimes incorrect work is associated with software failures.
What if the scales are not turned on after replacing the batteries?
How to extend the life of batteries in Xiaomi scales: 7 practical tips
The average battery life in the Mi Smart Scale 2 is 6-12 months, but with proper care, this period can be increased by 1.5-2 times.
- Keep the scales dry. Humidity speeds up battery discharge. Don't leave the device in the bathroom for long.
- Turn off the scales after use. Press the power button or wait for the automatic shutdown (after 10 seconds of inactivity).
- Use high-quality batteries. Cheap salt cells discharge 3-4 times faster than alkaline cells.
- Remove the batteries in long-term downtime, and if you haven't used the scales for more than a month, get the batteries out.
- Update your firmware. New software versions optimize your power consumption. Check for updates in Mi Fit.
- Don't drop the scales. The impacts can disrupt the contacts in the battery compartment, which will lead to increased power consumption.
- Periodically clean the contacts. Oxidation increases resistance, which causes the batteries to discharge faster.
If you follow these guidelines, the Xiaomi Scale 2’s batteries can last up to 18 months with moderate use (2-3 weighs per day).
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Alkaline batteries Duracell Plus or Energizer Max – the best choice for Xiaomi Mi Smart Scale 2 in terms of service life and price.
Where to buy batteries for Xiaomi Scale 2: review of proven places
You can buy the right food in different places, but it's important to choose reliable vendors to avoid counterfeiting.
- 🏬 Electronics chain stores: M.Video, Eldorado, Citilink. There are always Duracell and Energizer alkaline batteries available, but prices can be overpriced.
- 🛒 Supermarkets: Auchan, Lenta, Crossroads, often run on batteries GP Or Varta. It's convenient to buy with other products.
- 🌍 Online marketplaces: Wildberries, Ozon, Yandex Market. You can find profitable sets (for example, 10-20 batteries at wholesale price.
- 🏢 Specialized stores: All Instruments.ru, 220 Volts. Here are professional batteries with increased resource (for example, Panasonic Evolta).
- 💳 Pharmacies: Some pharmacies (e.g. 36.6) sell Cosmos or Fujitsu batteries, but the range is usually limited.
When buying, pay attention to:
- 📅 Shelf life - batteries lose charge even in the package.
- 🔍 Packaging – the original batteries have holographic stickers, protective seals and a clear logo printing.
- 💰 Price: if the cost of Duracell alkaline batteries is below 60 ₽ One piece, there's a risk of forgery.