Xiaomi Body Composition Scale 2: Which Batteries Are Right, How to Replace Them and Extend the Life of the Scale

Why battery selection is important for Xiaomi’s weight accuracy

The Xiaomi Body Composition Scale 2 has become a popular body composition control gadget, measuring not only weight, but also fat percentage, muscle mass, water level, and even bone density. However, many users face a problem: the device suddenly shuts down, shows incorrect data, or requires a replacement of batteries after a few months, the reason often lies in the wrong choice of batteries.

In this article, we will discuss exactly what batteries are needed for the Xiaomi Body Composition Scale 2, how to install them correctly, what errors lead to quick discharge, and give practical tips for extending the life of the gadget. You will also learn how original batteries differ from their counterparts, and why cheap batteries can spoil the accuracy of measurements.

Spoiler: If you use scales intensively (e.g., the whole family weighs itself daily), you will need to replace batteries after 4-6 months even with quality elements.

What batteries Xiaomi recommends

In the instructions for the Xiaomi Body Composition Scale 2, the manufacturer indicates that the device is powered by 4 AAA batteries (LR03).

• 🔋 Capacity: minimum 1000 mAh (optimally 1200-1500 mAh for long work).
• 🔄 Chemical composition: alkaline or lithium.Ni-MH is not recommended due to rapid charge loss.
• 🏷️ Xiaomi does not produce its own batteries, but advises using proven brands - Duracell, Energizer, Panasonic or GP.
• ⚡ Voltage: standard 1.5 V per cell (total voltage for 4 batteries – 6 V).

Important: Xiaomi Body Composition Scale 2 scales are sensitive to voltage stability. Cheap low-capacity batteries or fake elements can cause malfunctions in the bioimpedance analyzer, which will lead to inaccurate readings of body composition.

⚠️ Note: Use of rechargeable (battery) batteries AAA This can cause an Err error on the scale display, because the voltage (1.2 V) is below the standard 1.5 V, and the device recognizes this as a malfunction.

Step-by-step: how to replace batteries

Replacing the batteries in Xiaomi Body Composition Scale 2 seems like a simple procedure, but many users make mistakes that lead to breakdowns.

1. Preparation of scales: Turn the device over and find the battery compartment at the bottom, and it's covered with a plastic lid with a latch.
2. Opening compartment: Carefully tuck the lid with a nail or plastic card. Do not use metal objects - this can scratch the body.
3. Removing old batteries: Remove all 4 cells at once. If you leave at least one battery, it can cause a short circuit when installing new ones.
4. Contact cleaning: Wipe the contacts in the compartment with a dry wipe or cotton swab dipped in alcohol. Contact oxidation is a common cause of unstable balances.
5. Installation of new batteries: Insert elements according to polarity (marking) + and − Violation of the polarity of even one battery will lead to an error. LO.
6. Close compartment: Make sure the lid fits tightly. If it doesn't lock, check if the batteries are properly installed.

After the weights are replaced, they should automatically turn on. If the display does not light up, press the scale platform - this will reset a possible power error.

⚠️ Note: If after replacing the batteries, the scales show an Err error or do not turn on, check: Polarity of the installation (frequent error is one battery inverted); Contacts for oxidation or dirt; Battery compatibility (salt or Ni-MH elements may not work). If all batteries are installed correctly, but the scales do not respond, try the following: 1. Remove the batteries and wait 1 minute - this will dump the residual charge in the capacitors. 2. Install the batteries back and press the scales (as when weighing). 3. If it doesn't help, try using another set of batteries (possibly a defect in one of them). 4. In extreme cases, perform a weight reset via the Mi Fit app (Profile) → Devices → Xiaomi Scale 2 → Settings → Reset). Top.-5 The Xiaomi Body Composition Scale 2: rating 2026 Not all batteries of the year AAA We tested popular models and ranked them according to the criteria: duration of operation, voltage stability and price/quality ratio. Place Model Type Capacity Life in scales 1 Energizer Ultimate Lithium Lithium 1500 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh 12–18 Best choice for heavy use in months, working at extreme temperatures. 2 Duracell Plus Power Alkaline 1200 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh 8–12 The optimal price/quality ratio is suitable for most users. 3 Panasonic Evolta Alkaline 1100 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh 6–10 It's a good budget option, and it lasts longer than standard alkaline. 4 GP Super Alkaline Alkaline 1000 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh 4–8 Cheap months, but quickly discharged with frequent use. 5 IKEA Alkalisk 900 mAh 3-6 months The budget option is the most suitable if the scales are rarely used. Advice: if you buy batteries in stock, pay attention to the date of production. Alkaline cells lose up to 20% of capacity per year of storage, and lithium cells only 2-5%. It is best to buy batteries that were released no more than 6 months ago. 💡To check the freshness of the batteries in the store, shake the packaging. If you hear the noise of rolling elements inside, then they are already partially discharged (the new batteries have a thick electrolyte, and they do not hang out). Many owners of Xiaomi Body Composition Scale 2 experience the fact that the batteries die in just a couple of months. 90% of cases this is due to typical operating errors: 🔄 Mixing batteries of different types or brands. Even if they are the same, different containers or chemical composition lead to an uneven discharge. 🕒 Long-term storage of scales without use, if you don't weigh for more than a month, the batteries will run out due to leakage currents in the scale circuit. 🌡️ High humidity operation: Condensation on contacts accelerates corrosion and increases self-discharge. 📱 Permanent Bluetooth connection: If the scales are always synchronized with the smartphone via Mi Fit, they are more likely to wake up to transmit data, which consumes charge. ⚡ They lose their voltage quickly, and the scales start showing errors in 1-2 months. Another common problem is the oxidation of the contacts. If you notice white or green plaque on the metal parts of the compartment, you need to remove it. Moisten the cotton swab in vinegar or citric acid. Gently wipe the contacts. Let's dry for 10 to 15 minutes. Install new batteries. 💡The most common reason for quick battery discharge is not the quality of batteries, but the constant synchronization with the application. If you don't use the measurement history in Mi Fit, turn off automatic synchronization in the weight settings, which will extend the battery life by 30-50%. How to extend the life of batteries: 7 proven life hacks Even with quality batteries can face their rapid discharge, if you do not optimize the balance: 📴 Turn off automatic sync. Go to Mi Fit, select scales, and in the settings, turn off Auto Sync. Turn on Bluetooth only while weighing. 🔋 Use the power saving mode. Some of the firmwares on the scales have a hidden option to save battery. To activate it, perform 5 quick presses on the scales (without weighing) - the battery icon will appear on the display. 🏠 Keep the scales in a dry place. Humidity speeds up the corrosion of contacts. The ideal place is a bedside table or closet, away from the bathroom. ⏳ Don't leave the scales on, if you don't use the gadget for more than a week, remove the batteries, and that will prevent the current leakage. 🔄 Buy high-current batteries. Look for labels on the packaging that say High Drain or For Digital Devices, which are better suited for electronics. 🌡️ Avoid extreme temperatures. Do not place the scales near the heating battery or on the cold floor (e.g. in the bathroom in winter).°C. 🔍 Check your contacts regularly. Open the compartment every 2-3 months and inspect the metal parts for oxidation. If you follow these tips, even standard alkaline batteries will last 30-40% longer, and if you use Lithium Energizer Ultimate, the interval between replacements can reach 1.5-2 years! 💡If the scales began to show inaccurate data (for example, the weight "jumps" on the ±2 kg), this can be a sign of battery discharge. Don't wait for the battery to run out completely, replace the cells in advance to avoid failures in the bioimpedance sensor. Sometimes even after the correct replacement of batteries Xiaomi Body Composition Scale 2 refuse to turn on or show errors. Consider typical symptoms and their solutions: Symptom Display solution not turned on Incorrect battery polarity or contact oxidation Check battery installation, clean contacts alcohol Error LO Low voltage (discharged or incompatible batteries) Replace with new alkaline/lithium batteries Err short circuit or sensor malfunction Remove batteries for 1 minute, then set back Libras on but not synchronized with Fit Failure on the Mi Fit. Mi Mi Mi Mi Mi Mi weights, if you don't help out the weights from the other devices, "Brearrowse from the weight loss of the other" Check the integrity of the contacts in the battery bay (possibly bent). Contact Xiaomi Service Center if the warranty is still valid. ⚠️ Warning: If the scales show an Err error even after replacing the batteries, do not try to disassemble the device yourself! Xiaomi Body Composition Scale 2 uses adhesive joints, and if you open it sloppy, you can damage the bioimpedance sensors. FAQ: Answers to Frequent Battery Questions for Xiaomi Body Composition Scale 2: Can You Use Rechargeable Batteries? AAA? Nickel-metal hydride (Ni-MH) batteries have a voltage of 1.2 V instead of the standard 1.5 V, which can lead to errors. LO Or Err. If you want to use batteries, go for Li-ion) AAA 1.5V (e.g. Energizer Recharge). How many batteries do you need for the Xiaomi Body Composition Scale 2? The device runs on 4 AAA batteries (LR03). You can't install fewer or more, it will lead to unstable operation or failure. How do you know if the batteries need to be changed? Signs of discharge: Libras are on or require several taps. Weight readings or body composition become unstable. The LO error appears on the display. If you notice any of any of the symptoms, replace the batteries without waiting for them to be discharged? You can only quickly use the batteries from the low quality of the batteries. Why do scales quickly plant batteries, even if I rarely weigh? Probable reasons: Libras are constantly connected to Mi Fit via Bluetooth (even in sleep mode they consume charge). In the battery compartment, contacts have oxidized, which increases the leak current. You use salt or Ni-MH batteries with low capacity. Libras are stored in a wet room (for example, in the bathroom), which accelerates corrosion. Solution: turn off automatic synchronization, clean contacts and install quality alkaline batteries.