The Xiaomi Mi Body Composition Scale 2 has become a popular gadget for controlling weight, body composition, and even fat. But like any wireless device, it requires a power source called batteries. The question of “what batteries are needed for the Mi Scale 2” arises when users first buy or when the scales suddenly stop turning on. In this article, we will examine not only the type and size of batteries, but also the nuances of their replacement, brand choice, and also how to extend the life of batteries.
Many people mistakenly think that all smart scales are suitable for the same batteries, but this is not true. Xiaomi Mi Body Composition Scale 2 has specific requirements for the power supply, ignoring which can lead to malfunction of the device or even breakage. Next you will learn why it is important to use only recommended batteries, how to install them correctly and what to do if the scales do not respond after replacement.
What are the batteries you need for Xiaomi Mi Body Composition Scale 2?
According to the technical documentation from Xiaomi, the scales of the Mi Body Composition Scale 2 are powered by 4 AAA batteries (also known as "little finger").
- 🔋 Type of chemical composition: the manufacturer recommends the use of alkaline (LR03) lithium (FR03) They're just salt batteries (R03) They will quickly discharge and can leak.
- 📏 Voltage: Each battery must be supplied 1.5 B, the final voltage for the weights — 6 V (4 × 1.5 V).
- ⚠️ Rechargeable batteries (Ni-MH, Ni-Cd) – they have a lower voltage (1.2 V), which can cause malfunctions.
The original Xiaomi package sometimes contains a set of batteries, but it depends on the region of sale. If you purchased a scale without batteries, pay attention to the brand: it is better to give preference to proven manufacturers such as Duracell, Energizer or GP.
Why you can not use salt or battery
Many users are trying to save money by installing cheap salt batteries or rechargeable batteries in the Mi Body Composition Scale 2, which is fraught with several problems:
⚠️ Attention: Use of salt batteries (R03) The corrosion of the contacts often causes irreversible damage that the warranty does not cover.
- 🔋 Low capacity: Salt batteries will be discharged in 1-2 months of active use, while alkaline batteries last up to 6-12 months.
- ⚡ Unstable voltage: Batteries (Ni-MH) deliver 1.2 V instead of the required 1.5 V, which can cause measurement errors or synchronization failures with the Mi Fit application.
- 💧 Electrolyte leakage risk: Cheap batteries often flow at deep discharge, damaging electronic components.
If you do decide to use batteries, choose Li-ion AAA with 1.5V voltage, such as Energizer Ultimate Lithium. They are more expensive, but safe for scales and last up to 2-3 years.
How to replace batteries in Xiaomi Mi Body Composition Scale 2: Step-by-step
Replacing the batteries in Xiaomi smart scales is a simple procedure, but requires care. Follow the instructions to avoid damage to contacts or the case:
☑️ Preparation for battery replacement
- Turn the scales down, and at the bottom of the case, you'll see the battery lid.
- Move the lid in the direction indicated by the arrow (usually → or PUSH) and it will be removed effortlessly.
- Remove the old batteries by paying attention to the polarity (+ and -). There's a marking in the bay where which side should look.
- Install new batteries with polarity. Start with the extreme slots, then insert the middle ones.
- Close the lid before you click. Make sure it fits tightly -- that's important for tightness.
⚠️ Warning: If the scales are not turned on after changing, check: Battery installation correct (turn them over and try again) Contact oxidation (clean with a cotton swab dipped in alcohol) Factory reset (press the switch on button for 10 seconds).
After the battery is replaced, the scales are automatically synced to the Mi Fit app if previously connected. If sync is not happening, reconnect the device via Settings → Add the device.
How long do batteries last in Mi Body Composition Scale 2 and how to extend them?
The battery life of Xiaomi smart scales depends on several factors: the type of batteries, frequency of use and storage conditions.
| Type of battery | Service life (with daily use) | Advantages | Deficiencies |
|---|---|---|---|
| Alkaline (LR03) | 6–12 months | Low price, wide availability | They can leak in a deep discharge. |
| Lithium (FR03) | 12-24 months | Long service life, resistant to extreme temperatures | High cost |
| Rechargeable Ni-MH | 3–6 months | Reusable use | Low voltage (1.2 V), risk of failure |
To extend the life of batteries, follow these tips:
- 🔌 Turn off the scales if you don't use them for longer than a week, which will reduce background power consumption.
- 🌡️ Keep the scales dry at room temperature. Humidity and cold speed up discharge.
- 📵 Remove the batteries if you don’t plan to use the scale for more than a month.
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If the scales have been lying without use for more than 3 months, replace the batteries even if they do not discharge - over time they lose charge and can leak.
How to buy batteries for Xiaomi Mi Body Composition Scale 2: the best options
AAA batteries are sold at any electronics store, but not all are suitable for smart scales.
- 🏆 Best pick: Duracell Plus AAA (alkaline) - the optimal ratio of price and quality, rarely flow.
- ⚡ The Energizer Ultimate Lithium AAA — They last up to 2 years and are resistant to temperature changes.
- 💰 Budgetary option: GP Super Alkaline AAA — cheaper than branded, but high-quality.
- ♻️ Eco-option: Eneloop AAA (Rechargeable – only if you are willing to accept the risk of failure.
Buy batteries in the best places:
- 🛒 Offline: "M. Video", "Eldorado", "Svyaznoy" - there you can check the date of production (fresh batteries last longer).
- 🌍 Online: Wildberries, Ozon, AliExpress (note reviews of leaks).
- 🏢 Specialty stores: All Tools, 220 Volts – there are often professional batteries.
⚠️ Warning: Avoid buying batteries at markets or stalls, where there is a high risk of running into counterfeits or expired goods. Check the date of manufacture on the package: optimal shelf life of alkaline batteries - up to 5 years.
Frequent Battery Problems and Solutions
Even if you use the right batteries, the Xiaomi Mi Body Composition Scale 2 can be problematic.
| Problem. | Possible cause | Decision |
|---|---|---|
| Libras not included | Incorrect installation of batteries or contact oxidation | Check the polarity, clean the contacts with alcohol |
| The testimony is confused. | Low voltage (discharged or inappropriate batteries) | Replace with new alkaline or lithium |
| Libras are spontaneously turned off | Bad contact of the compartment cover | Close the lid before clicking or buckle the contacts |
| Not synchronized with Mi Fit | Failure after battery replacement | Reconnect the device in the application |
If after replacing the batteries, the scales still do not work, try resetting the settings:
- Remove all batteries.
- Press the power button (if any) for 15 seconds.
- Set the batteries back and turn the scales on.
What to do if the batteries leak?
Alternative ways of power: can you use batteries or power bank
Some users are trying to modify the Xiaomi Mi Body Composition Scale 2 scale by connecting it to external power sources.
- 🔋 Batteries. AAA: ✅ Only lithium-ion (1.5V) is suitable, for example Energizer Recharge. ❌ Conventional Ni-MH (1.2V) causes unstable operation.
- 🔌 Connection to USB (adapter): ⚠️ Not recommended - scales are not designed to be powered continuously by the mains, the risk of overheating or short circuit.
- 🔄 Power bank: Technically possible via a special adapter, but violates warranty.May cause measurement failures due to unstable voltage.
If you want a long-term offline, you'd better buy a spare set of FR03 lithium batteries and change them as you discharge.
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Using a power bank (USB) is a security issue and can cause the scales to break, with the original AAA alkaline or lithium batteries being the best option.