Xiaomi Redmi Note 4 is a legendary smartphone that is still used by millions of users, but over the years, even the most reliable battery loses capacity: the phone runs out in half a day, turns off at 20-30%, overheats while charging. How do you know if it's time to change the battery or a software problem?
In this article, we’ve got 5 proven ways to diagnose a Redmi Note 4 battery (including the mido and nikel models), from hidden engineering menus to third-party applications. You’ll learn how to check real wear, current capacity in mAh, number of charging cycles and even battery temperature.
1. Check through the engineering menu (no root)
The fastest way to get data about the battery is to use a hidden engineering menu, which is available on all Redmi Note 4s regardless of the MIUI version (even on the outdated MIUI 9).
Instructions:
- 📱 Open the phone app and enter the combination: ##4636##
- 🔋 In the menu that appears, select Battery Information).
- 📊 Note the lines: Level - current charge in percentage; Voltage - voltage (normal: 3.7-4.2 V); Temperature - temperature (critical if above 45).°C).
⚠️ Attention: If the voltage is below 3.5 V at 100% charge, the battery is severely worn out.°C during charging the risk of battery bloating increases 3 times.
No, no. No. 4636 is not working##?|Try ##284##|Remove the “star” symbols and spaces when entering|Restart your phone and try again.-->
2. USSD codes for battery diagnostics
In addition to the engineering menu, the Redmi Note 4 has special features. USSD-They're not going to show capacity in mAh, but they're going to help identify critical issues.
Enter the phone in turn in the application:
- 🔢 ##6484## - Battery test (will show good or replace status);
- 🔢 ##64663## - Checking the power controller;
- 🔢 ##2846579## → ProjectMenu → Battery Test (alternative path).
If the message "Connection problem or invalid MMI code" appears after entering the code, it means:
- 📵 Your firmware blocked engineering commands (relevant to customized ones) MIUI);
- 🔄 Try entering the code through the Google Phone app (install from Play Market);
- 🛠️ On some versions of the Redmi Note 4 Pro (Nikel model) only ##4636 works##.
Once a month |Only when problems start |Never checked |Uspeak special apps-->
3. Applications for detailed diagnostics
Third-party utilities show more data than standard menus. For Redmi Note 4, you can:
| Annex | What shows | Need root? | Reference |
|---|---|---|---|
| AccuBattery | Capacity, wear, temperature, charging cycles | No. | Play Market |
| CPU-Z | Voltage, battery technology (Li-Ion/Polymer), operating time | No. | Play Market |
| Battery Guru | Discharge schedules, wear forecast, charging recommendations | No. | Play Market |
| AIDA64 | Full battery specifications, including factory capacity | No (but with root more data) | Play Market |
How to use AccuBattery (the most accurate app for Redmi Note 4):
- 📥 Install and open the application.
- 🔄 Charge your phone to 100% (the app will determine the real capacity).
- 📊 Go to the Health tab – there will be an indicator of Estimated capacity).
- ⚠️ If the value is below 2500 mAh (originally in the Redmi Note 4 was 4100 mAh) – the battery is critically worn out.
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In AccuBattery, disable the option “Optimize charging” – it artificially lowers the capacity indicators on old smartphones.
4. Verification through ADB (advanced)
If the engineering menus and apps don’t give you the full picture, you can connect to your phone via the Android Debug Bridge (ADB), which will show you the actual number of charging cycles and the factory settings of the battery.
Instructions:
- 🖥️ Install. ADB-PC drivers.
- 📱 On the phone, turn on the debugging. USB (Settings → The phone. → Version. MIUI → Press 7 times, then Settings → Additionally. → For developers).
- 🔌 Connect Redmi Note 4 to your computer and type in the command line: adb shell dumpsys battery
In conclusion, pay attention to the lines:
- Capacity is the current charge in %;
- Voltage: voltage;
- Technology: battery type (Li-ion or LiPo)
- charge_counter — the amount of mAh consumed from the last charge (helps to estimate the real consumption).
⚠️ Attention: If in conclusion ADB There's a line called health: 3, which means critical battery failure!
5. Visual Diagnostics: When to Change the Battery Without Tests
Sometimes the battery is visible to the naked eye. Check out the Redmi Note 4 for the following:
- 🔋 Bloating – if the back cover is moving away, the screen is “going in a wave” or the phone is not lying flat on the table;
- 🔥 Overheating – the battery heats up above 40°C even with a simple charge;
- ⚡ Charge jumps – for example, from 50% immediately to 20% or switch off at 30%;
- 🕒 Fast discharge – less than 4 hours of work with moderate use;
- 🔌 Charging problems – the phone does not take charge or only charges when it is off.
How to check for bloating:
- 📏 Put your phone on a flat surface (glass or table).
- 🔍 Spin it - if it swings like a "boat," the battery swells.
- 🖐️ Press the center of the back cover – if you feel resistance or a bubble, it’s 100% bloating.
What happens if you ignore the battery?
Table: Critical performance of the Redmi Note 4 battery
Check this out to see if it’s time to change your battery:
| Parameter | Norma. | Warning | Critical, replacement! |
|---|---|---|---|
| Capacity (mAh) | 3500–4100 | 2500–3499 | Less than 2,500. |
| Depreciation (%) | 0–20% | 21–50% | More than 50% |
| Voltage (B) | 3.7–4.2 | 3.5 to 3.6 or 4.3+ | Less than 3.5 or more than 4.4 |
| Temperature (°C) | 20–40 | 41–45 | More than 45. |
| Charging cycles | Less than 300. | 300–500 | More than 500. |
⚠️ Warning: If your Redmi Note 4 turns off at 15 to 30 percent charge, it's called a cut-off effect. It's because the battery controller malfunctions. In 80 percent of cases, only replacing the battery helps.
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If the battery capacity fell below 60% of the factory (less than 2460 mAh for the Redmi Note 4), its life is exhausted - further operation will lead to a sharp degradation and the risk of bloating.