Owners of smart health gadgets often encounter confusing symbols on the display that can be confusing.The situation when Xiaomi scales show L is quite common and usually does not indicate a breakdown of complex electronics. This code is a standard indicator of the state of the battery built into the device.
Many users mistakenly believe that the appearance of the letter "L" indicates a critical failure in the work of strain gauges or software. In fact, it is just a signal from the control system that reports a low charge level, and ignoring this warning will cause the device to stop turning on or begin to transmit incorrect data about weight.
In this article, we will take a closer look at why smart scales give off this signal, how to replace batteries correctly, and what to do if the new energy doesn’t solve the problem. You will learn about the nuances of connecting through Mi Fit and understand how to avoid common mistakes when servicing a gadget.
Decoding the L error code on the display
The letter "L" on the scale screen is an abbreviation of the English word "Low", which means "low." In the context of electronic measuring devices, this is a universal code indicating that the voltage at the contacts of the battery has fallen below the acceptable threshold for stable operation of the microcontroller. The scales continue to function, but their accuracy can be reduced.
It's worth noting that current models, like the Mi Body Composition Scale 2, have very sensitive electronics, and they can analyze body composition, including muscle and fat mass, which requires a lot of energy at the time of measurement, and if the charge is low, the device will not be able to conduct a full cycle of analysis and will give a warning.
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Replace all batteries in the bay at the same time. Mixing old and new batteries causes uneven discharge and can damage contacts.
Some users confuse this code with a weighing error, but they look different. An overload error is usually labeled as "Err" or "OL" (Over Load), and an unstable surface can cause numbers to flash. The L code appears immediately after putting your foot on the platform or when the device is turned on.
Types of food elements used
It is important to use the same energy sources as the manufacturer for the device to work properly. Different Xiaomi and Mijia scales can use different battery form factors, and most commonly, standard finger elements such as AA or thinner AAAs.
Particular attention should be paid to the type of chemistry of the element: alkaline batteries last much longer than salt batteries and hold the load better. Lithium batteries can perform even better, especially in low temperatures, if the scales are in an unheated room.
Rechargeable batteries (Ni-MH) are possible, but their rated voltage is often 1.2 volts versus 1.5 volts in conventional batteries, which can cause the scales to show low charge almost immediately after installation, even if the batteries are fully charged.
Below is a table of compatibility and characteristics of the batteries for popular models:
| Model of weights | Type of battery | Number of | Nominal voltage |
|---|---|---|---|
| Mi Body Scale 1 | AA (LR6) | 4 pcs. | 1.5 V. |
| Mi Body Scale 2 | AAA (LR03) | 4 pcs. | 1.5 V. |
| Mi Smart Scale | AAA (LR03) | 4 pcs. | 1.5 V. |
| Yunmai Mini | AAA (LR03) | 4 pcs. | 1.5 V. |
Instructions for replacing the elements of power
The process of replacing batteries does not require special skills, but requires accuracy. Libra is an accurate measuring device, and any careless movement can disrupt the calibration. Before starting work, make sure that the surface on which the scales are standing is flat and hard.
Turn the device down. On the back is a battery compartment that's covered with a plastic cover, which is usually fixed to latches or a small screw. If you use a screw, use a suitable cross screwdriver to keep the hat from breaking.
☑️ Battery replacement algorithm
Notice the markings inside the compartment. The "+" and "-" signs must be strictly consistent with the poles of the elements being installed. Once the lid is installed, turn the scales over and stand on them with one foot to activate the screen. If the L code is gone and zeros or current weight appear, the procedure was successful.
⚠️ Warning: Never leave a battery inside the device for long-term storage. They may leak and the leaked electrolyte will irrevocably damage the contact weight group.
Contact problems and oxidation
Even if you just installed new batteries, and Xiaomi scales continue to show L, the problem can be in poor contact.Over time, metal plates in the compartment can oxidize or become covered with a layer of dust, which prevents current from passing.
To fix this problem, take a cotton swab lightly soaked in alcohol or a special contact cleaner, carefully wipe the metal plates inside the compartment and the contacts on the batteries themselves, let the alcohol completely evaporate before installing the cells.
Sometimes the spring contacts can be slightly deformed or bent, in which case you can bend them upwards carefully, with minimal effort, to ensure a tighter fit to the end of the battery. Be careful not to break the thin metal.
What to do if the batteries are hanging?
Resetting and reconnection in the annex
After the power change, the device may need to be re-synchronized with the smartphone, sometimes the scales retain an error in memory or cannot connect to the server to transmit body composition data, using the Mi Fit (now Mi Fitness) or Zepp Life app.
Go to the Bluetooth settings on your phone, find the device in the list and click "Forget this device" or "Disable." Then open the app, go to profile and select your scales. In the upper right corner, find the device settings menu and select the "Unplug" or "Delete" option.
Once you remove the device from the app, press the reset button on the scales (if there is one, usually a small hole in the back) or simply remove and insert the batteries again. Run the search for the devices in the app again. The pairing process will take about 10-15 seconds.
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A full pairing reset in an application often solves data transfer problems, even if the L error on the screen has already been fixed.
Diagnosis of strain gauge malfunctions
If battery replacement and contact cleaning didn't help, and the scales still show L or are behaving inadequately, one of the four strain gauges located at the corners of the platform may have failed. These sensors are very sensitive to impact and overload.
Try putting the scales on a perfectly flat, hard surface (tile, concrete). Soft carpets or linoleum can distort readings and cause calibration errors. Step on the scales and sway from side to side, spreading the weight evenly.
If the display display appears chaotic characters, weight "jumps" or the device turns off immediately after switching on with new batteries, this is a sign of hardware failure, in which case repair may not be economically feasible compared to buying a new model.
⚠️ Warning: Don't expose the scales to extreme temperature changes. If you bring them from the cold, let the device warm to room temperature for a period of time. 2-3 hours before switching on, otherwise the condensation inside can cause a short circuit.