Have you ever wondered how accurate Xiaomi’s smartphone is at showing battery power percentage?The official status bar indicator often rounds things up or runs with an error of 5-10%.This can be a problem if you need to know exactly how much time is left before a full discharge — for example, on a trip without access to an outlet or before an important call.
In this article, we will discuss all possible ways to check the battery balance on Xiaomi, Redmi and other devices. POCO — standard-function MIUI You'll learn how to see real battery voltage in millivolts, how to calibrate readings, and why percentages sometimes hang on a single value. Instructions are relevant for all models, including the Xiaomi 14, Redmi Note 13 Pro+ and POCO F6.
1. Standard method: indicator in status bar and notification panel
The most obvious method is to look at the battery icon in the upper right corner of the screen. On MIUI 14/15, it shows the default charge percentage, but if there's no number, turn it on like this:
- Open Settings → Notifications and Status bar.
- Put it on the Battery Indicator.
- Choose the option of Percent or Icon with a percentage.
You can also swipe down from the top of the screen to open the notification bar.
- 🔋 Exact percentage of charge (in step 1%).
- 🔌 Charging state (charged, discharged or connected).
- ⚡ Estimated time to full charge/discharge (on some models).
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If the percentage of charge is “hung” on one value (for example, 80% does not change an hour), try to restart the smartphone – this will reset the cache of the power controller.
However, this method has two serious drawbacks:
- The readings are rounded (for example, 87% can mean both 86.5% and 87.4%).
- MIUI does not take into account battery degradation – if the capacity has dropped by 20%, the indicator will still show 100% as.
2. Hidden menu of engineering settings (#4636##)
For those who want to see the battery’s technical data — voltage, temperature, charge level in millivolts — there’s a hidden Testing menu available on all Xiaomi smartphones without root rights.
Instructions:
- Open the Phone app.
- Enter the combination: ##4636### (some models may require ##6484###).
- In the menu that opens, select Battery Information.
Here you'll see:
| Parameter | What does it mean? | Normal values |
|---|---|---|
| Level | Charge level in % (no rounding) | 0–100 |
| Voltage | Voltage in millivolts (mV) | 3700-4400 mV (depending on model) |
| Temperature | Battery temperature in °C | 20-45°C (critically above 50°C) |
| Health | Battery status (if maintained) | Good (good), Unknown (unknown) |
What to do if the #4636## menu doesn't open?
⚠️ Warning: Do not change the parameters in the engineering menu unless you understand their meaning! Incorrect settings can lead to accelerated battery wear or even overheating of the device.
3. Battery monitoring applications: AccuBattery, GSam Battery Monitor
The standard MIUI tools provide limited information, and we recommend using third-party apps for detailed diagnostics.
- 📊 Real battery capacity (taking into account degradation).
- 🔋 Charge/discharge currents in milliamperes (mA).
- ⏱️ Time to complete discharge at current consumption.
- 📉 Wear schedules for several months.
The best apps for Xiaomi:
- AccuBattery (free, with premium options): 🔹 Health (battery health) as a percentage of original capacity. 🔹 Tracks charging cycles (critically over 500 cycles). 🔹 Offers optimal charge levels (e.g. 80% for durability).
- GSam Battery Monitor (paid, but with trial period): 🔹 Details the cost of applications (including background processes). 🔹 Shows Deep Sleep (time in sleep mode).
Install the application and do:
1. Charge your phone to 100% and wait for notifications from AccuBattery
2. Discharge to 0% (until it switches off)
3. Repeat the cycle 2-3 times for calibration
4. Check the Health section for wear-and-wear assessment-->
⚠️ Note: AccuBattery-type applications require continuous monitoring over multiple charging cycles to collect accurate data.If you just installed the program, Health readings may not be correct.
AccuBattery|GSam Battery Monitor|Other |Not used-->
4. ADB commands for advanced users
If you want the most accurate data directly from Android, you can use ADB (Android Debug Bridge), which is suitable for tech-savvy users and requires a computer.
Instructions:
- Install ADB Tools on your PC.
- Turn on USB Debugging on Smartphone: Settings → About Phone → MIUI Version (Tap 7 Times) Settings → Additional → For Developers → Debugging on USB
- Connect your phone to your PC and execute the command line: adb shell dumpsys battery
In response, you will receive data of the type:
level: 78
scale: 100
voltage: 4012 (mV)
temperature: 310 (31.0°C)
current now: 120 (mA)
technology: Li-ionDecoding of key parameters:
- Level - current charge in % (without rounding).
- Voltage is voltage (for example, 4012 mV = 4.012 V).
- Current now is a discharge current (negative value) or charge current (positive).
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ADB shows raw data from the power controller, without processing MIUI. This is the most accurate method, but requires command line skills.
5. Battery calibration: when the indicator lies
If your Xiaomi suddenly shuts down at 20-30% charge or freezes at one percent, the problem could be in the power controller being out of sync.
Step-by-step:
- Discharge the phone before automatically shutting down.
- Connect the original charger and charge up to 100% without including the smartphone.
- After reaching 100%, keep charging for another 1-2 hours.
- Turn on your phone and check the percentage in the engineering menu (#4636###).
If calibration doesn’t work, the reasons may be more serious:
- 🔋 Battery wear (capacity below 70% of nominal value).
- 🔌 Failure of the power controller (requires repair).
- 📱 Firmware problems (will help flashing).
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After calibration, check the actual battery capacity in AccuBattery. If it is below 80% of the factory capacity (for example, 3500 mAh instead of 4500 mAh), consider replacing the battery.
6. Frequent Questions and Myths About Xiaomi Battery
There are many myths around Xiaomi batteries, and let's take a look at the most popular ones.
Myth 1: “Recharging to 100% kills the battery.” Reality: Modern Xiaomi smartphones (starting with the Mi 10) have built-in protection – after 100% charging stops, and recharging to 100% only occurs when you drop to ~95%. However, prolonged exposure to 100% (for example, at night) really accelerates degradation.
Myth 2: “You have to discharge your phone up to 0% once a month.” Reality: This was true for nickel batteries 20 years ago. Lithium polymer batteries at Xiaomi don’t have a “memory effect,” and deep discharges (below 3%) damage the battery.
Myth 3: “Fast charging ruins the battery.” Reality: Xiaomi’s Quick Charge and HyperCharge technologies are certified and safe. It’s overheating while charging (above 45°C) that is harmful, not the speed itself.