Xiaomi’s smart floor scales are popular gadgets for weight and body composition, but their work depends on the right power source. Many users are faced with the question: what batteries are needed for the Mi Body Composition Scale, how to replace them and what to look for when buying? In this article, we will analyze all the nuances – from the types of batteries to step-by-step instructions for replacing, and give recommendations for extending the life of the device.
It is important to understand that the wrong choice of batteries can lead not only to quick discharge, but also to incorrect readings of the scales or even damage to internal components. For example, using cheap salt batteries instead of alkaline reduces the life of 2-3 times, and lithium cells, although longer, may not be compatible with some models.
Types of batteries for Xiaomi scales: what to choose?
All Xiaomi floor scales use standard AAA-type batteries, but their chemical composition and brand play a key role. The manufacturer recommends installing alkaline batteries as they provide stable voltage and long lifespan.
- 🔋 Alkaline is the best choice, with a lifespan of 6-12 months in daily use, examples: Duracell, Energizer, GP.
- 🔋 Lithium is longer-lasting than alkaline (up to 2 years), but more expensive, suitable for high-power models (e.g. Mi Body Composition Scale 2).
- 🔋 Zinc-Chloride is a budget option, but discharges quickly (2-3 months.
- 🔋 Battery (Ni-MH) - rechargeable, but require regular recharging. 1.2V against 1.5V Disposable, which can cause measurement errors.
Important: Xiaomi Mi Body Composition Scale 1 and 2 are voltage sensitive — if it falls below 1.3V, the device may be showing the wrong weight or shutting down. So low-capacity batteries are not suitable. The Smart Scale 2 manual explicitly states that using non-alkaline cells voids the warranty.
Comparison of batteries by characteristics: compatibility table
To make it easier to choose, we have compiled a table with the characteristics of popular batteries and their compatibility with Xiaomi weights. Pay attention to the capacity (mAh) and voltage – this depends on how long the device will last without replacing the elements.
| Type of battery | Capacity (mAh) | Voltage (V) | Compatible with Mi Scale 1/2 | Approximate service life |
|---|---|---|---|---|
| Alkaline (Alkaline) | 1000–1200 | 1.5 | ✅ Complete. | 6–12 months |
| Lithium (Lithium) | 1200–1500 | 1.5 | ✅ Complete (recommended for Scale 2) | 12-24 months |
| Salt (Zinc-Chloride) | 500–800 | 1.5 | ⚠️ Partial (possible errors) | 2–4 months |
| Battery (Ni-MH) | 600–1000 | 1.2 | ❌ Not recommended. | 3–6 months |
And you can see from the table that lithium batteries are the best choice for price-life, but they'll cost more than alkaline batteries. If you use scales rarely (like once a week), you can save money and buy quality alkaline cells, but salt batteries are only suitable for emergency replacement when there's nothing else at hand.
⚠️ Warning: Do not use batteries of different types or brands at the same time! different internal resistance can cause electrolyte leakage and damage to the balance contacts.
Step-by-step: how to replace batteries in Xiaomi scales
Replacing the batteries in Xiaomi smart scales takes no more than 5 minutes, but requires caution.
- Turn the scales down, and at the bottom, you'll see the battery lid.
- Find a slot to open (usually marked with an arrow or OPEN) and place the lid on with a nail or a flat screwdriver.
- Remove old batteries by observing polarity (+ and − specified in the compartment).
- Install new items by following the labeling. Make sure the contacts fit tightly.
- Close the lid before you click. Libras automatically turn on - wait for calibration (the display will appear 0.0).
Make sure that new batteries are of the same type and brand|
Check the expiration date (specified on the packaging)|
Clean contacts in the oxidation compartment (if necessary)|
Take a picture of the old batteries (if you doubt the polarity)-->
If after the weight change is not included:
- 🔄 Check the polarity of the batteries – flip them.
- 🧹 Clean the contacts with a cotton swab soaked in alcohol.
- 🔋 Try another battery pack (maybe marriage).
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If the scales show the wrong weight after replacing the batteries, reset: press and hold the on button (if any) or put the scales on a flat surface and wait 10 seconds before automatic calibration.
Frequent mistakes in choosing and replacing batteries
Even experienced users sometimes make mistakes that lead to quick discharge or breakage of the scales, the most common of which are:
- 🔋 Battery mixing – using elements of different types (e.g. alkaline) + Lithium, or different levels of charge, which causes uneven loading and shortens lifespan.
- 🕒 Ignoring shelf life - batteries are stored for 3-5 years, but after expiration, lose up to 30% of their capacity!
- 🧲 Cold storage - if the scales are in a high-humidity bath, the batteries may oxidize.Optimum storage temperature: 10–25°C.
- 🔄 Improper disposal - throwing batteries into regular garbage is forbidden).
Another common problem is that the scales don't turn on after the battery is replaced, and the reasons may be:
- Short circuit due to improper installation (check polarity).
- Oxidation of contacts in the compartment (clean them with a swallow or alcohol).
- Marriage of batteries (check them with a multimeter or in another device).
⚠️ Warning: If after replacing the batteries, the scales show an Err or Lo error, it means the voltage is too low.Try lithium batteries or contact a service center - the power board may be faulty.
How to extend the life of batteries in Xiaomi scales?
The average battery life in smart scales is 6-12 months, but with proper care, it can be extended to 18 months.
- Turn off the scales from the Bluetooth network when not using. To do this, press the on button (if any) or simply remove the batteries for a long period of downtime.
- Keep the scales dry. Humidity speeds up the corrosion of the contacts and the discharge of the batteries. If the scales are in the bathroom, wipe them after each use.
- Use high-capacity batteries, such as the Duracell Turbo or Energizer Ultimate Lithium, which last 20 to 30 percent longer than standard batteries.
- Avoid extreme temperatures. Do not leave the scales on the balcony in winter or in direct sunlight in summer.
What to do if the batteries are quickly discharged?
Fun fact: Xiaomi Mi Body Composition Scale 2 has an automatic shutdown function that works after 30 seconds of inactivity, which reduces power consumption by 40% compared to the first version, and if you have an older model, you can manually turn off the scales after each use.
Where to buy batteries for Xiaomi scales: proven options
You can buy suitable batteries from any electronics store, but we recommend paying attention to proven manufacturers and platforms:
- 🛒 Offline stores: M.Video, Eldorado, Svyaznoy - here you can check the expiration date and packaging.
- 🌍 Online: Wildberries, Ozon, Yandex Market – convenient to compare prices and read reviews.
- 🏢 Specialized stores: Battery technologies, Battery.ru - a wide range of lithium and alkaline elements.
- 🔧 Xiaomi Service Centers – Sometimes sell original battery packs with warranty.
Average prices for AAA batteries (package 4 units):
- Duracell Alkaline — 200–250 ₽
- Energizer Lithium — 350–400 ₽
- GP Super Alkaline — 150–180 ₽
- Panasonic Eneloop Battery – 600–800 ₽ (charger)
⚠️ Warning: When buying batteries on marketplaces, check seller ratings and reviews. Counterfeiting brands (such as Duracell) often have understated capacity and flow quickly.
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For the scales Xiaomi Mi Body Composition Scale 2 best suited lithium batteries Energizer Ultimate Lithium – they provide stable voltage and last up to 2 years without replacement.