How to accurately check the charge of headphones Xiaomi Basic 2: from the case to hidden commands

Xiaomi Basic 2 wireless headphones have become a hit thanks to a combination of price, sound quality and battery life. But even with the claimed 12 hours of operation on a single charge, users often face unexpected discharges. LED-Battery Level Indicator: All information is hidden in flashing lights, beeps and a mobile app, and if you don't know how to read them correctly, you risk being left without music at the most inopportune moment.

In this article, we’ll look at all the possible ways to test your battery, from the standard (via smartphone and case) to the little-known (hidden voice commands and engineering menus). You’ll also learn why headphones can show false battery levels and how to fix it. The instructions are suitable for the original Xiaomi Basic 2 (TWSEJ04LS model) and their clones — check compatibility before using.

1. Checking the charge through the indicator on the case

The most obvious, but often misinterpreted way is that there is one white LED on the front of the Xiaomi Basic 2 case that signals battery status. Here's how to decipher it:

• 🔋 Blinks 1 time when opening the lid - case charge 0-25% (critical level).
• 🔋 Blinks 2 times - case charge 26-50%.
• 🔋 Blinks 3 times - case charge 51-75%.
• 🔋 Blinks 4 times - case charge 76-100%.
• 🚨 Red indicator (instead of white) – case discharged to 5% or less.

The key is that the lights only show the charge of the case, not the headphones themselves, and to get the battery level of the headphones, you have to take them out of the case, and then the LED will flash at a different frequency:

• 🎧 1 short blinking – headphone charge 0–30%.
• 🎧 2 blinkings - 31-70%.
• 🎧 3 blinks - 71-100%.

⚠️ Warning: If the indicator does not flash at all, it may mean a complete discharge or malfunction of the contacts inside the case.

2. Voice prompts and audible signals

Xiaomi Basic 2 can talk about the level of charge in Chinese and English, and this function only works when you connect to your phone and the voice prompts are turned on (default switched off) to activate it:

1. Connect the headphones to the phone via Bluetooth.
2. Open the Mi Home app (or Xiaomi Wear for newer versions).
3. Go to the headphone settings → Voice prompts.
4. Turn on the battery status option.

Now when you plug in, the headphones will be able to voice the charge level.

If voice prompts don’t work even after turning on, try resetting your headphones to factory settings: press the button on your case for 10 seconds until the indicator starts flashing red and white.

3. Verification through the mobile application

The official Mi Home app (or Xiaomi Wear for new devices) shows the exact percentage of charge for both headphones and case.

• 📱 The app should be the latest version (update to Google) Play/App Store).
• 🔗 Headphones must be connected to the phone via Bluetooth.
• 🌍 The region in the Mi Home should match the region of the headphone purchase (e.g. China for the global version).

Instructions for verification:

1. Open Mi Home and find your headphones in the list of devices.
2. Click on them and the control panel will open.
3. At the top of the screen you will see two indicators: Left earphone, Right earphone and Case.

Problem: sometimes the app shows incorrect data (e.g. 100% at real 20%) due to a synchronization error.

Close the application through the multitasking menu |

Turn off Bluetooth on your phone for 30 seconds |

Remove the headphones from the list of devices in Mi Home|

Reconnect them again through Add the device-->

4. Hidden commands for engineering menu

Few people know, but the Xiaomi Basic 2 supports hidden diagnostic commands, including battery testing, which run over a Bluetooth connection and do not require root rights on the phone.

• 📱 Android smartphone (on the iPhone does not work).
• 🔧 The nRF Connect app (free on Google Play).

Step-by-step:

1. Install and open nRF Connect.
2. Connect to your headphones (they should show up as MI BASIC 2).
3. Go to the Unknown Service tab.
4. Press Write and type the command: AT+BATT?
5. Headphones will answer with a line of the form: +BATT:LEFT=85, RIGHT=83, CASE=60 where the numbers are the percentage of charge of the left earphone, right and case, respectively.

⚠️ Attention: Do not enter others AT-- The wrong team, if you don't know their purpose, AT+RESET) It can reset the headphone settings.

5. Alternative methods (without telephone)

If there is no smartphone at hand, you can check the charge by other methods:

• ⚡ Power Bank Charge: Connect the case to the power bank. If the indicator lights up red, the case charge is below 10%. If white, above 10%.
• ⏱️ Operating time: Fully charged headphones must last 10-12 hours at medium volume. If they sit down in 4-5 hours, the battery is worn out.
• 🔊 When you turn on the sound: When you remove it from the case, the headphones emit a short signal. If the sound is quiet or intermittent, the charge is below 20%.

Lifehack for travel: If you need to know the charge without your phone, put your headphones in the case and close the lid. In 5 seconds, open it again, the indicator will flash as many times as the percentage left in the case (rounded to 25%). For example, 3 blinks = 75%.

💡

If the headphones are quickly discharged, check your phone’s Bluetooth settings: Turn off Absolute Volume, which reduces power consumption by 15-20%.

6. Frequent mistakes and how to avoid them

Xiaomi Basic 2 users often experience incorrect charge display, and here are the main reasons and solutions:

Critical case: If the headphones suddenly turn off at 30-40% shown, this is a sign of battery degradation. Xiaomi Basic 2 uses lithium polymer batteries with a capacity of 43 mAh (earphones) and 300 mAh (case), their lifespan is 300-500 charging cycles, after which the capacity drops by 20-30%.

💡

If the headphones are older than 2 years and hold a charge of less than 4 hours, it is time to change the battery. In Xiaomi service centers, it costs ~ 1,500 rubles (2026).

FAQ: Answers to Frequent Questions