Xiaomi floor scales are some of the most popular smart gadgets for home use, but even they require periodic maintenance. The main question that arises from owners is: what batteries are needed for the correct operation of the device? The type of batteries affects not only the accuracy of measurements, but also the life of the scales, and the wrong choice can lead to failures in sync with the Mi Fit application or complete failure of equipment.
In this article, we will analyze all the current Xiaomi scale models (including the Mi Body Composition Scale 2, Smart Scale 2 and others), specify the exact types of batteries based on their technical characteristics, and give a step-by-step instruction on how to replace them.
If you are faced with the problem that Xiaomi scales are not turned on, show an Err error or do not sync with your smartphone, in 80% of cases, the battery is to blame.
Xiaomi’s official recommendations: which batteries to use
The manufacturer specifies the standard type of battery in most weight models, 4 AAA batteries (LR03), but this is a general recommendation that does not take into account the nuances:
- 🔋 Mi Body Composition Scale 2 (Model) XMTZC05HM) — 4 × AAA (1.5V). Both alkaline and lithium batteries are suitable, but with reservations.
- 🔋 Xiaomi Smart Scale 2 (model) XMTZC02HM) — 4 × AAA, but sensitive to voltage: when using nickel-metal hydride (Ni-MH) batteries, failures are possible.
- 🔋 Mi Scale (First Generation, XMTZC01HM) — runs 3 × AAA, but rarely sold.
Important: Xiaomi does not recommend rechargeable batteries (e.g. Ni-MH or Ni-Cd) due to unstable output voltage. The best choice is alkaline batteries (e.g. Duracell, Energizer) or lithium batteries (e.g. Energizer Ultimate Lithium).
The documentation for the Mi Body Composition Scale 2 notes that when using batteries with voltages below 1.4V, the scales can show a “Lo” error and turn off, which means that even new but cheap batteries (such as salt) may not work.
Battery Types Comparison: Which Is Better for Xiaomi Libraries
Not all AAA batteries are the same, but they can be divided into 4 main categories, each with pros and cons for use in smart scales:
| Type of battery | Voltage (V) | Duration of service (approx.) | Pluses | Cons |
|---|---|---|---|---|
| Alkaline (Alkaline) | 1.5 | 6–12 months | Stable voltage, affordable price, wide range | Discharge faster in the cold, can occur with long storage |
| Lithium (Lithium) | 1.5 | 18-24 months | Long service life, work at low temperatures, light | Not all models are compatible with Xiaomi weights |
| Salt (Zinc-Chloride) | 1.5 | 3–6 months | The cheapest. | Fast discharge, unstable voltage, risk of leakage |
| Ni-MH batteries | 1.2 | Rechargeable | Reusable, eco-friendly | 1.2V voltage may not be enough, scales show "Lo" error |
For Xiaomi scales, mid-range and premium alkaline batteries are the best choice. Lithium batteries are suitable if you are willing to overpay for a long life, but check compatibility with your model before buying (for example, in the Mi Body Composition Scale 2 they work without complaints, and in the Smart Scale 1 they can cause failures).
⚠️ Note: If you are using Ni-MH batteries (1.2V), The scales may not work properly due to insufficient voltage, in which case try replacing them with alkaline scales or calibrate the scales through the Mi Fit app (Device Settings section). → Sizing).
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Before buying batteries, check the date of production on the packaging. Fresh cells (released no more than 6 months ago) will last longer, especially if they are alkaline or lithium models.
Step-by-step: how to replace batteries in Xiaomi scales
Replacing the battery in Xiaomi’s scales is a simple procedure, but there are a few nuances that will help avoid errors. Below is a universal guide that is suitable for most models (Mi Body Composition Scale 2, Smart Scale 2, etc.).
- Preparation: Turn the scales over and find a battery compartment, which is usually located in the center of the bottom panel and is closed with a latch or screw lid (depending on the model).
- Opening of the bay: 🔧 If the lid is on the latch, gently place it with a flat object (for example, a mediator or a plastic card). 🔧 If the lid is on the screw - use a cross screwdriver (usually a screw type). PH0).
Removal of old batteries:
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Installation of new batteries:
Closure of the compartment:
Verification of work:
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☑️ What to check after replacing batteries
If after weight replacement, you do not turn on or show an error, follow the following steps:
- 🔄 Reset the scales: Remove the batteries for 30 seconds, then insert back.
- 📱 Reconnect the scales to the Mi Fit app: Remove the device in the Profile section → My devices. Start looking for new devices and follow the instructions on the screen.
- 🔧 Check contacts in the battery compartment for oxidation or contamination.