Xiaomi Mi Smart Scale 2 has become one of the most popular gadgets for home use due to its accuracy, integration with the Mi Home ecosystem and affordable price. However, even such a simple device requires proper maintenance - especially when it comes to power. Many users are faced with the question: what batteries are needed for the Mi Smart Scale 2, how to replace them correctly and can you extend the life of the Mi Smart Scale?
In this article, we will discuss all the nuances related to the batteries for Xiaomi Mi Smart Scale 2: from the official manufacturer’s recommendations to life hacks on battery saving. You will learn what power cells are compatible with the device, how to avoid replacement errors and what to do if the scales stopped turning on after installing new batteries.
If you've just purchased a scale or noticed that it's starting to fail, this information will be especially useful. Don't rush to buy the first batteries you get -- some types can not only quickly discharge, but also damage the electronics of the device. Next, a detailed analysis with expert advice and step-by-step instructions.
Requirements: Which batteries are suitable for Xiaomi Mi Smart Scale 2
The manufacturer clearly indicates in the documentation that for the Mi Smart Scale 2 (model) XMTZC02HM) 4 type batteries are required AAA (LR03). These are standard finger-eating elements that are easy to find in any electronics store or supermarket. AAA-Batteries are equally useful for smart weights.
It is important to consider three key parameters:
- Capacity - it depends on how long the scales will last without replacing. Optimal option: 1000-1200 mAh.
- The chemical composition is alkaline or lithium, which are more expensive but last longer and work better at low temperatures.
- Brand – Cheap nameless batteries can leak and damage contacts inside the device.
In the table below – a comparison of popular batteries AAA, Compatible with Mi Smart Scale 2:
| Brand | Type | Capacity (mAh) | Duration of service (note) | Price for 4 pcs. (ruble) |
|---|---|---|---|---|
| Duracell | Alkaline | 1100 | 12-18 months. | 300–350 |
| Energizer | Alkaline | 1000 | 10 to 14 months. | 250–300 |
| GP | Alkaline | 950 | 8-12 months. | 180–220 |
| Panasonic Evolta | Alkaline | 1200 | 18-24 months. | 350–400 |
| VARTA Longlife | Lithium | 1250 | 24+ moss. | 500–600 |
⚠️ Note: Do not use rechargeable (battery) batteries AAA! They have a lower voltage (1.2 V vs. 1.5 V for alkaline), which can lead to incorrect operation of the sensors or complete failure of the device. Xiaomi officially prohibits their use in the Mi Smart Scale 2.
How to replace batteries in Xiaomi Mi Smart Scale 2: Step-by-step instructions
Replacing batteries in smart scales is a simple procedure, but there are some critical nuances that are often overlooked: If you do something wrong, the scales may not turn on or show incorrect data.
Preparation of the device
Turn the scales downwards (on the display).
Find a battery compartment – it is located in the center of the bottom cover and closed with a plastic cap.
Carefully put a flat screwdriver or nail on the stub, don't make excessive efforts to keep the latches from breaking!
2. Removal of old batteries
- Remove all 4 items at the same time. If you pull them out one at a time, you can reset your settings (for example, reset the binding to your Mi Home account).
Check the contacts inside the compartment for oxidation or corrosion, and if there's white plaque, clean it with a cotton swab dipped in alcohol.
Installation of new batteries
- Insert the elements strictly polarity (plus to plus, minus to minus).
Use batteries of the same type and brand, mixing different models can lead to uneven discharge and shortened lifespan.
Close the plug before clicking - it should fit tightly, otherwise the scales will spontaneously turn on from vibrations.
4. Checking the performance
- Turn the scales and wait for the load (the Mi logo will appear on the display).
- Stand on the scale - if the readings are stable, the replacement was successful.
If the scales are not included, check:
- The correct installation of batteries (turn them over).
Contacts (possibly oxidation has not been completely removed).
Batteries (Try others, even if new)
Buy 4 batteries AAA brand and type|Prepare a screwdriver or plastic card to open the compartment|Check the shelf life of batteries (on packaging)|Clear the contacts in the compartment if necessary|Make sure the scales are disconnected from Bluetooth before being replaced-->
How long are batteries in Mi Smart Scale 2 and how to extend their life
The average battery life in Xiaomi Mi Smart Scale 2 is 12-18 months with regular use (1-2 weightings per day).
🔹 Frequency of use: The more you stand on the scale, the faster the batteries run out. When used intensively (5).+ Once a day, they will last 6-9 months.
🔹 Storage temperature - in a cold room (below) +10°C) alkaline batteries lose up to 30% of their capacity. Lithium batteries are more stable.
🔹 Quality of batteries – cheap batteries can leak in 3-4 months, spoiling contacts.
🔹 Weights settings – some features (like a permanent Bluetooth connection) increase energy consumption.
To maximize the life of batteries, follow these tips:
- 🔋 Turn off Bluetooth if you are not syncing with Mi Home. To do this, go to the in-app balance settings and deactivate the Autoconnect option.
- 📴 Remove the batteries if you don’t plan to use the scales for longer than a month (such as on vacation) and this will prevent self-discharge.
- 🌡️ Keep the scales dry at room temperature. Humidity accelerates the corrosion of contacts.
- 🔄 Use batteries from the same package. Even items from the same brand can have different levels of charge if they are different times.
⚠️ Warning: If the scales start to turn on without pressing or show the wrong weight, this is a sign that the batteries are almost dead.
💡
If you use scales rarely (once a week), remove one battery from the bay. This will interrupt the power chain and prevent self-discharge. Before using, just insert it back in.
What to do if the scales do not work after replacing batteries
Mi Smart Scale 2 is not turned on after installing new batteries, and the causes can vary from a simple installation error to serious malfunctions.
🔍 1. Incorrect installation of batteries
Check the polarity, one of the elements may have been inserted by the wrong side.
Make sure all 4 batteries are new (do not mix alkaline and lithium batteries).
Try to knock on the scales easily - sometimes the contacts do not fit fully.
🔌 Contact oxidation
If there is a green or white coating on the metal plates inside the compartment, clean them with a stripe or alcohol.
After cleaning, wipe the contacts with a dry wipe - moisture can cause a short circuit.
📱 3. Resetting settings
If the scales are on but not connected to the Mi Home, there may have been a reset.
1. Remove the device from the application.
2. Press and hold the button on the scales for 5 seconds (until the display blinks).
3. Complete the pairing procedure again.
🔧 4. Faulty payment
If none of these methods worked, the problem could be the electronics, and most often the voltage stabilizer fails due to surges in current (for example, when using cheap batteries).
In this case, contact the Xiaomi service center or try self-repair (only if you have experience with a soldering iron).
Critical information: If after replacing the batteries, the scales show an Err error or flash all the display segments, this means a repolarization (one of the batteries is inserted incorrectly). Immediately remove the elements and check their location - prolonged work in this mode can burn the controller.
What to do if the batteries leak?
Alternative power sources: can you use batteries or power bank?
Many users are wondering whether it is possible to power the Mi Smart Scale 2 from batteries, USB Or an external source? The answer is definitely not, and here's why:
❌ Rechargeable batteries AAA (Ni-MH, Ni-Cd)
- Voltage 1.2 V instead of the required 1.5 V results in:
- Incorrect weight readings (accuracy to the ±500g).
- Unintentional shutdowns.
- Quick discharge (you will have to recharge every week).
Xiaomi does not guarantee the operation of the device with batteries.
❌ Connection to USB power bank
Libras do not have a built-in voltage stabilizer for external power supply.
- Current supply through homemade adapters (e.g. cutting off) USB-cable) could burn the fee.
- Even if we can get it 6 V (4 × 1.5 B), the scales are not designed for constant feeding and may overheat.
✅ The only safe option is disposable alkaline or lithium batteries. AAA. If you want an eco-friendly or economical option, consider buying a scale with an integrated battery (e.g. Xiaomi Smart Scale 2 Pro).
⚠️ Attention: On the Internet you can find "instructions" for the conversion of scales for power from USB It's extremely risky -- even if you make a successful modification, you lose your warranty, and the device can fail due to power surges.
💡
Use of non-original power sources (batteries, USB) It causes a loss of warranty and a risk of failure, and the only reliable way is to have quality alkaline or lithium batteries. AAA.
Where to buy batteries for Xiaomi Mi Smart Scale 2: the best places and prices
There are several places you can buy the right smart scale batteries, but the prices and quality are very different. Here's a list of the best options for price/quality ratio:
- 🛒 Offline electronics stores (M.Video, Eldorado, Svyaznoy): - Pros: you can check the expiration date, immediately pick up. - Cons: prices are higher by 20-30% compared to online. - Advice: Look for shares - often batteries are sold in sets of 8-12 pieces at a discount.
- 🌐 Online marketplaces (Wildberries, Ozon, Yandex Market): - Pros: wide range, customer reviews, low prices. - Cons: risk of running into a fake (especially in little-known brands). - Advice: Buy from trusted sellers with a rating of 4.8+.
- 🏪 Supermarkets (Pyaterochka, Magnet, Auchan): - Pros: convenient to buy with products. - Cons: limited choice (most often only Duracell or Duracell) GP). - Check the date of production - in supermarkets batteries can lie for years.
- 🔧 Specialized stores (e.g. All Instruments.ru): - Pros: a large selection of professional batteries (e.g, VARTA Industrial. - Cons: high price, long delivery. - Advice: Suitable if you need batteries with high capacity (for example, for heavy use).
💡 Lifehack: Buy batteries in bulk (sets of 10-20 each) that are cheaper, and if stored properly (in a dry place with a dry place). +10…+25°C) they will not lose capacity within 5-7 years.
In the table below - current prices for popular batteries AAA (as of 2026):
| Brand and model | Type | Price for 4 pcs. (ruble) | Where to buy cheaper |
|---|---|---|---|
| Duracell Basic | Alkaline | 280–320 | Ozon (stock) |
| Energizer Max | Alkaline | 250–300 | Wildberries |
| GP Super Alkaline | Alkaline | 180–220 | Five. |
| Panasonic Evolta | Alkaline | 350–400 | M. Video (sale) |
| VARTA Longlife | Lithium | 500–600 | All Tools.ru. |
Frequent User Mistakes and How to Avoid Them
Even a simple procedure like replacing batteries can be a problem if you make mistakes. TOP-5 Mistakes made by owners of Xiaomi Mi Smart Scale 2, and how to prevent them:
🚫 Mistake 1: Using different types of batteries or brands
Consequences: Uneven discharge, electrolyte leakage, malfunction.
Solution: Buy a set of 4 identical batteries from the same package.
🚫 Mistake 2: Storing the scales in a wet room (bathroom)
Consequences: Corrosion of contacts, shortening the life of batteries.
Solution: After use, wipe the scales with a dry cloth and store them in a dry place.
🚫 Mistake 3: Forced closure of battery compartment
- Consequences: Latches break, cracks in the body.
Solution: Close the lid effortlessly – if it doesn’t fit in, check if the batteries are inserted correctly.
🚫 Error 4: Ignoring Error Error on the Display
Consequences: Overheating of the board, failure of sensors.
Solution: If you have an error, immediately remove the batteries and check the polarity.
🚫 Mistake 5: Buying the cheapest batteries
Consequences: Rapid discharge, leak, damage to the device.
- Solution: Optimal balance of price/quality — GP Or Duracell, for long-term work — VARTA Longlife.
⚠️ Note: If you use scales for commercial purposes (such as a fitness club), replace batteries with lithium batteries – they hold a charge longer with frequent use and are less prone to leaks.