Xiaomi smart scales have become an integral part of a healthy lifestyle for millions of users. They accurately measure weight, fat percentage, muscle mass and even bone density β but only on one condition: if they have the right and working batteries. It would seem that it could be easier than replacing batteries? However, many face problems: the scales do not turn on after replacing, show an Err error, or the batteries go down too quickly.
In this article, weβll discuss which batteries are needed for each Xiaomi smart scale model (from the budget Mi Smart Scale 1 to the flagship Xiaomi Smart Scale 3), how to install them correctly to avoid failures, and what to do if the scales stop working after replacement. Also, youβll learn whether you can use batteries instead of conventional batteries, how to extend their lifespan and where to buy batteries so as not to run into a fake. Spoiler: not all AAA batteries are equally useful!
What batteries are needed for different models of Xiaomi smart scales
The first thing to know is that Xiaomi uses two main battery types in its scales, AAA (little finger) and CR2032 (tablets), the specific type depends on the device model. Here is a complete list of the number of elements:
- π Xiaomi Mi Smart Scale 1 β 4 Γ AAA (LR03)
- π Xiaomi Mi Body Composition Scale 2 β 4 Γ AAA (LR03)
- π Xiaomi Smart Scale 2 β 4 Γ AAA (LR03)
- π Xiaomi Mi Smart Scale 3 β 1 Γ CR2032 (pill)
- π Xiaomi Body Fat Scale 2 β 4 Γ AAA (LR03)
Important! Models with CR2032 (such as Smart Scale 3) require special attention: the tablet must be lithium with a voltage of 3V. Using alkaline or salt analogues will lead to unstable operation or failure. Also in Smart Scale 3, the battery is set up polarity upwards (plus to the compartment cover), which often causes errors when replacing.
For scales on AAA, both Duracell, Energizer and Lithium batteries are suitable, the latter last longer (up to 2 years in daily use), but cost more. But cheap salt batteries should be abandoned, they will run out in a couple of months.
How to replace batteries: step-by-step instructions
What would seem to go wrong with battery replacement? It turns out a lot. For example, if you set the polarity wrong in Smart Scale 3, the scales will show an Err error and refuse to turn on. And in models with AAA, you often forget to reset the settings after replacing, which makes the scales "don't see" new batteries. Here's the universal instruction:
βοΈ Preparation for battery replacement
- Turn the scales over and find the battery compartment, which is in the center of the bottom panel in most models, and is covered with a plastic cover, and to open it, pull a special slot or pull a screwdriver (carefully so as not to damage the latches!).
- Remove the old batteries. If they leak, don't touch the contacts with your bare hands, use gloves or a napkin. You can remove the oxidation with a cotton swab dipped in alcohol.
- Install new batteries while observing polarity. In models with AAA, there is usually a diagram on the lid of the compartment. In Smart Scale 3, the CR2032 battery should lie plus up (to the lid) - this is critical!
- Close the lid of the compartment and turn on the scales. If the display has an Err error or the scales do not respond, reset (press the on button for 10 seconds).
If the weight changes, you get the wrong data (like weight jumps), try calibrating it: put it on a flat surface, press the switch, and wait 5 seconds until zero appears. Then stand on the scale and wait for a stable reading.
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Before replacing batteries, take a picture of the old cells in the compartment to avoid errors with polarity, especially in models with CR2032.
How much battery life in Xiaomi smart scales and how to extend their life
The battery life depends on three factors: the type of battery, the intensity of use, and the quality of the contacts in the compartment.
| Model of weights | Type of battery | Service life (with daily use) | Notes |
|---|---|---|---|
| Mi Smart Scale 1 | 4 Γ AAA (Alkaline) | 6-9 months | Lithium Energizer Ultimate lasts up to 1.5 years |
| Mi Body Composition Scale 2 | 4 Γ AAA (Alkaline) | 8-12 months | Sensitive to humidity β store in a dry place |
| Smart Scale 3 | 1 Γ CR2032 (lithium) | 1.5β2 years | When the weight is below 2.5V, the weights are switched off. |
To make the batteries last longer:
- π Turn off the scales after use (if there is a power button) in standby mode, they continue to consume energy to sync with the Mi Fit.
- π‘οΈ Keep the scales in a dry place. Humidity accelerates the corrosion of contacts, which leads to a leak of current.
- π Use batteries of the same type and brand. Mixing alkaline and lithium cells shortens their lifespan.
- π± Update your firmware. New versions optimize your power consumption (check the updates in the Mi Fit app).
A critical nuance for Smart Scale 3: if the CR2032 battery is discharged to 2.3V, the scales can stop turning on even after replacement, in which case βresuscitationβ is required β connecting to the charger on 5V through the contacts of the compartment (a soldering iron and electronics skills are needed).
Can I use batteries instead of batteries?
The idea of replacing disposable batteries with rechargeable batteries seems reasonable β environmentally friendly and economical. But with Xiaomi smart scales, this doesn't always work.
- β Suitable for models with AAA: π Nickel-metal hydride (Ni-MH) batteries with a capacity of 800-1000 mAh (for example, Eneloop). π The voltage should be 1,2V (1,5V batteries, but the scales are stable.
- β Not suitable for Smart Scale 3: π« Batteries. CR2032 voltage 3,6V (against 3V batteries, which may damage the charge. π« Lithium batteries of this type are not designed for frequent charging cycles.
If you decide to use batteries in scales with AAA, consider:
β οΈ Warning: Batteries discharge faster in the cold, if the scales are in the bathroom where the temperature is below 18Β°C, Ni-MH capacity drops by 20β30%, and double reset may be required after replacement: first hold the switch on for 10 seconds, then repeat the procedure after restarting.
To charge AAA batteries, use smart chargers with ΞV control (e.g. La Crosse BC-700) to prevent overcharging that shortens the battery life.
Frequent Battery Replacement Mistakes and How to Avoid Them
Even experienced users sometimes make mistakes that lead to a malfunction of the scales.-5 problems and solutions:
- Err error after replacement. Causes: Wrong polarity (especially in Smart Scale 3); Bad contact due to oxidation or contamination; discharged batteries (even new ones can be defective); Solution: Check polarity, wipe contacts with alcohol, try other batteries.
- Libras are not turned on. Possible causes: CR2032 battery dies in Smart Scale 3 (even if it's new, check the voltage with a multimeter); contacts in the compartment are clogged (dust, fat); firmware failure (solved by flashing through Mi Fit).
Decision:
Libras show the wrong weight. This happens if:
- The batteries are discharged unevenly (for example, two new and two old).
- The scales are not calibrated after replacement.
- Sensor is damaged (diagnosis is required).
Where to buy batteries for smart scales Xiaomi: a review of proven options
Battery quality is a direct influence on the balance, and cheap fakes from well-known brands (Duracell, Energizer) often have a smaller capacity and can leak.
- π Official stores: Xiaomi Store (there are original batteries sold) CR2032 Mi Home (in some countries there is a kit of 4 batteries on sale) AAA Xiaomi-logo).
- π Online stores: AliExpress (look for sellers with higher ratings) 98% and long life reviews. Amazon (note certificates) UL or CE packed). Wildberries/Ozon (Check the manufacturerβs country β it is better to take batteries from Japan or Germany).
- π¬ Offline stores: Network hypermarkets (Auchan, Lenta, Globe) - there are often shares on Duracell batteries or GP. Specialized electronics stores (Svyaznoy, M. Video) - you can find lithium batteries AAA.
The cost of batteries varies:
- π AAA (4 pcs): from 200 β½ (salty β½ (Lithium Energizer Ultimate).
- π CR2032 (1 pcs): from 50 β½ (no-name - up to 200 β½ (maxell).
β οΈ Warning: Never buy batteries CR2032 There is a high risk of running into a low voltage fake (2,8V instead 3V), This will cause a malfunction of Smart Scale 3. Check the packaging for holograms and production dates.
If you use scales intensively (for example, for professional weight control), consider buying in bulk. On AliExpress you can find packages of 10-20 pieces. CR2032 from proven brands (Panasonic, Sony) at a price of 30-40 β½ piecewise.
Alternative ways of powering: solar panels and power bank
For those who are tired of constantly changing batteries, there are some innovative solutions, but they are not suitable for all scale models:
- βοΈ Solar panel, suitable for scales with AAA, If you modify them, for example, you can solder a small solar panel (5V 100mA) Cons: Requires soldering skills, scales should stand in the light, and the panel takes up space.
- π Power bank through USB. In some models (for example, Mi Body Composition Scale 2) you can replace the battery compartment with a battery compartment. USB-output-module 4,5V (You need to resweeten the contacts. Pros: you don't need to change the batteries, you can use any power bank. Cons: you lose portability, the risk of overheating with prolonged use.