How to know the power of Xiaomi: all the ways from indicators to applications

Xiaomi's external batteries have long been used for traveling, business trips, and just using your smartphone away from the power outlet. But how do you know how much power is left in the power bank when the indicators are not always clear and the applications show different data? This problem is familiar to many: you take a charged power bank with you, and after an hour it suddenly discharges, even though the indicators yesterday showed a "full charge."

In this article, we’ll look at all the different ways you can test your power bank Xiaomi’s power, from standard LED lights to hidden features and third-party apps. You’ll learn how different methods are for different models (from Mi Power Bank 1 to Xiaomi HyperCharge 200W), why the indicators are sometimes lying, and how to get the most accurate data. And how to check the actual battery capacity if you think it’s running out too fast.

1. Standard charge indicators: what do LEDs mean

Most power bank Xiaomi is equipped with LED indicators that show the level of charge when you press a button. However, few people know that the number of light bulbs burning does not always correspond to the real percentage, it depends on the model and version of the firmware.

Here’s how to decipher indicators for popular models:

• 🔋 1 LED – 0-25% charge (on some models – 0-30%).
• 🔋🔋 2 LEDs – 25-50% (or 30-60% for Mi Power Bank 3).
• 🔋🔋🔋 3 LEDs – 50-75% (sometimes up to 80%).
• 🔋🔋🔋🔋 4 LEDs – 75–100% (on Xiaomi HyperCharge means 80–100%).

Important: on some models (for example, Mi Power Bank 2C), the indicators go out 3-5 seconds after pressing the button. If you do not have time to count, you will have to press again. Also, some power banks (for example, Xiaomi Mi Power Bank Pro) have a double click to activate the capacity check mode, in which case the LEDs flash in a different order.

⚠️ Note: On cheap counterfeits, indicators often show 100% charge even at 20% real capacity. If your power bank discharges too quickly, check it for authenticity through the official Mi Home app or by using the serial number on the Xiaomi website.

2 How to check the charge through USB-cable (hidden function)

Few people know, but many power bank Xiaomi supports a hidden diagnostic mode that allows you to know the exact percentage of charge through a connection to a smartphone or PC. This method works for models with a chip Texas Instruments or Injoinic (for example, Mi Power Bank 3 Pro, Xiaomi HyperCharge 100W).

Instructions:

1. Connect the power bank to a charged smartphone (preferably Xiaomi/Redmi/Poco) via a USB-C → USB-C cable.
2. On your smartphone, go to Settings → The phone. → Version. MIUI and tap 7 times on the line "Version" MIUI", to enable the developer mode.
3. Return to Settings → Additional → For developers and activate Debugging over USB.
4. Connect your smartphone to your PC, open the Command Prompt (Windows) or Terminal (Mac/Linux) and type:

adb shell dumpsys battery

In the conclusion, find the lines level (power bank level) and voltage.

level: 78


voltage: 3850

This means that the power bank has 78% of the charge left, and the battery voltage is 3.85V.

Install ADB-PC drivers|Enable debugging on USB smartphone|Use the original cable USB-C|Power Bank should be connected to a smartphone, not to charging-->

⚠️ Note: This method may not work on budget models (e.g. Redmi Power Bank) due to simplified electronics. MIUI block access to battery data – in this case, try using third-party applications (about them below).

3. Charge checking apps: which ones work with Xiaomi

If you don't want to mess around with ADB, you can use specialized applications, but not all of them work correctly with Xiaomi's power bank -- many show the power of the smartphone, not the external battery. We tested 10 apps and selected the 3 most accurate ones:

How to use AccuBattery (the most reliable option):

1. Connect the power bank to your smartphone.
2. Open the application and go to the Charging tab.
3. Slip the battery icon in the upper right corner - there will be the capacity of the external battery (if supported).
4. For accuracy, wait until the smartphone charges by 5-10% – so the application will “see” real data.

Tip: If the app doesn’t show data, try reconnecting the cable or using another port (such as USB-C instead of USB-A). On some models (such as Xiaomi HyperCharge 200W), you need to turn on PD (Power Delivery) mode in the power bank settings to work correctly.

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If the app shows a charge of 100%, but the power bank discharges quickly, check it for authenticity through the official Xiaomi website or Mi Verify service. Counterfeit products often have an understated real capacity (for example, instead of 20,000 mAh – only 10,000 mAh).

4. Multimeter Verification: for Advanced Users

If you want the most accurate data (for example, to test battery wear), you can use a multimeter, which requires minimal knowledge of electronics, but gives you real voltage and approximate capacity.

What you need:

• 🔧 Multimeter (even a cheap) DT-830 will do).
• 🔌 Two crocodile wires".
• 📱 Power Bank with disassembled case (or access to battery contacts).

Instructions:

1. Disconnect power bank from all devices.
2. Disassemble the case (on most models it is glued - use a plastic blade so as not to damage the battery).
3. Connect the black multimeter probe to the negative contact (usually a black wire), and the red probe to the plus one (red wire).
4. Set the multimeter in the constant voltage (DC) measurement mode to the limit of 20V.
5. For example, 3.85V corresponds to ~70% charge for lithium polymer batteries.

To convert the voltage to percentages, use this table:

5. How to check the real capacity of the power bank (discharge test)

If you think the power bank is draining too fast, you can run a full capacity test.

• 📱 Smartphone with known battery capacity (for example, Redmi Note 12 with a battery of 5000 mAh).
• 🔌 Original cable and power supply (to eliminate heat loss).
• ⏱️ Time (test takes 4-8 hours).

Step-by-step:

1. Fully charge the power bank (all 4 indicators should burn).
2. Discharge your smartphone to 1% and turn it off.
3. Connect your smartphone to a power bank and turn it on. Set the time.
4. Wait until your smartphone is fully charged to 100% (use the AccuBattery app for accuracy).
5. Repeat steps 3-4 until the power bank is completely drained.
6. Count how many times it has fully charged the smartphone. Multiply that number by the battery capacity of the smartphone.

Example of calculation:

Power Bank charged Redmi Note 12 (5000 mAh) 3.2 times to full discharge.

Real capacity. = 5000 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh × 3.2 = 16000 mAh (instead of the stated 20000 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh).

This is normal: all power banks lose 15 to 30 percent of their capacity to heat, convert voltage and circuit losses, and if the actual capacity is less than 60 percent of what it claims, your battery is worn out or it's fake.

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A digit test is the only way to know the actual capacity of a power bank, and even the most accurate applications show data with an error of 10-15%, and indicators up to 20%.

Frequent problems and their solutions

Sometimes power bank Xiaomi behaves strangely: the indicators flash randomly, the charge drops too quickly or the device refuses to charge.

• ⚡ Indicators do not burn when you press a button: Check if the battery is completely dead (plug it into charging for 10-15 minutes). If it does not help, the button could stick (try to clean it carefully with alcohol).
• 🔄 Power Bank discharges quickly even without load: This is a sign of battery wear (especially if the device is not loaded) >2 years.Try to reset the controller: completely discharge and then charge the power bank 3 times in a row.
• 🚫 Does not charge the smartphone, although the indicators are on: Check the cable and port on the smartphone (maybe the problem is not power bank).On some models (for example, Xiaomi HyperCharge) you need to double press the button to turn on the output current.

If nothing helps, try updating the firmware of the power bank (if your model supports it).

1. Connect the power bank to your PC via USB-C.
2. Download the official Mi Flash Tool from Xiaomi website.
3. Follow the update instructions (usually hold the power bank button for 5-10 seconds until the PC recognizes it).

⚠️ Note: Unrenewed power bank Xiaomi (especially released before 2020) may have a bug with an incorrect charge display, for example, after updating the firmware Mi Power Bank. 2C The indicators began to show the real level, not overestimated values.

7. Comparison of methods: which is the most accurate?

We tested all the charging methods on 5 Xiaomi power bank models (from budget to premium).

The bottom line is that if you want to be as accurate as possible, you can use a multimeter or a discharge test, and the ADB method is useful for diagnosis, but it requires skill.

FAQ: Answers to Frequent Questions