How to check the battery status on Xiaomi Redmi Note 5: the complete guide

Xiaomi Redmi Note 5 — one of the most popular smartphones 2018 Even with a reliable battery capacity. 4000 The mAh eventually degrades. If the phone runs out in half a day, it suddenly turns off when it's gone. 20-30% When you're charged or overheated while you're charging, it's time to diagnose the battery. 5 proven ways to assess her condition, including hidden engineering menus, third-party apps and physical examination.

It's important to understand that battery performance is not just dependent on the number of charging cycles, but also on operating conditions, such as using fast charging, overheating in the sun, or storing with zero charge accelerates wear and tear, and we'll look at how to distinguish software failure from physical battery degradation, and what to do if capacity falls below critical levels.

1. Verification through the engineering menu (without applications)

The most reliable way is to use a hidden MIUI engineering menu that shows real data from the battery controller, which requires no root rights and works on any version of the firmware.

Instructions:

1. Open the Phone app.
2. Enter the combination: ##4636###.
3. In the menu that appears, select Battery Information.

In this section, pay attention to:

• 🔋 Level of charge (level) – current percentage in the firmware (may differ from the one displayed on the screen).
• 🌡️ Temperature (Temperature) – the norm is 25–40°C, above 45°C critically.
• ⚡ Voltage – should be 3.7–4.2V 100% charge.
• 🔄 Health – Perfectly Good, Unknown or Replace soon signals problems.

💡

If the engineering menu does not open, try entering the code through the Calculator app (enter the sequence of numbers as a mathematical expression).

Note: If the Health setting shows Dead or Overheat, the battery needs to be replaced soon – this can be dangerous!

2. Use of secretive USSD-code

Xiaomi hides several utility codes for iron diagnostics, including the battery.They run on the Redmi Note 5 (codenamed whyred) regardless of the MIUI version.

Basic codes:

• 📱 ##6484## - Hardware test (select Battery Test).
• 🔍 ##64663## - Detailed information about the power module.
• 🔋 ##36446337## - Alternative access to battery data (on some firmware).

Once you enter the code ##6484##, you will see a screen with a voltage graph: Green zone (3.8-4.2V) is normal, red zone (below 3.4V or above 4.3V) is critical, and if the graph is constantly "jumping" between zones, it is a sign of an unstable controller or worn-out cells.

3. Applications for battery diagnostics

If the engineering menu seems complicated, use third-party utilities that visualize data and often provide optimization recommendations.

Top.-3 apps for Redmi Note 5:

How to use AccuBattery (Step-by-step):

Charge the phone before 100% and plug in the app|Calibrate the sensors (Calibration section)|Use your phone in normal mode 2-3 day-day|Check the capacity schedule in the Health section|Compare the current capacity with the passport (4000 mAhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh)-->

Important: applications show the estimation capacity, not the exact one. The error can be as high as 10 to 15 percent. USB-Tester or diagnostics at a service center.

Physical inspection of the battery

If software methods show a critical state, examine the battery visually to help detect bloating or corrosion, the main causes of sudden shutdowns.

Signs of malfunction:

• 🔧 Bloating – the screen or back cover is “up”, the phone is not exactly on the table.
• 🔥 Traces of oxidation on contacts (green/white plaque).
• 💥 Extraneous sounds when moving (crunch, creak) - a sign of damage to cells.
• 🌡️ Local overheating – one part of the body is hotter than the other.

💡

If the battery is swelling, turn off the phone immediately and do not use it! The risk of fire or explosion during further use is extremely high.

How to safely remove the battery for inspection:

1. Turn off the phone and remove it. SIM-map.
2. Heat the back cover with a hairdryer (temperature not higher than 60°C) to soften the glue.
3. Carefully tuck the lid with a plastic spatula (not metal!).
4. Disconnect the battery plume from the motherboard.

⚠️ Warning: Do not puncture or bend the battery - this can lead to a short circuit.If you are not sure of your skills, contact the service.

5. Test by means of USB-tester

Use for accurate diagnosis USB-tester (cost from 500) ₽). It measures real capacity, current and voltage when charging/discharging. Suitable for the Redmi Note 5 with original or unoriginal battery.

How to run the test:

1. Connect the tester between the charger and the phone.
2. Discharge the phone to 5% and connect to the charger.
3. Record the tester every 10 minutes to 100% charge.
4. Compare the actual capacity (in mAh) with the passport (4000 mAh).

Example of depreciation:

• Actual capacity: 3200 mAh.
• Passport capacity: 4,000 mAh.
• Wear: (4000 - 3200) / 4000 × 100% = 20%.

Normal wear for a 2–3 year old battery is up to 30%, and if it is above 50%, replacement is recommended.

6. Battery calibration (if the phone shows the wrong percentage)

Sometimes the problem isn't the battery, but the controller's calibration is wrong, and it turns off at 30 percent, and then it turns on at zero after charging.

How to recalibrate:

Discharge the phone before automatically shutting down|Connect to the original RAM and charge up to 100% (do not turn on!)|Turn off charging, turn on the phone and wait for the full load|Repeat the discharge / charge cycle 2-3 times-->

If calibration doesn't work, reset settings through Settings → System → Reset → Reset all settings. This will delete user data, but return factory settings to the power controller.

⚠️ Warning: Don't use applications to "restore" battery capacity -- they're useless. The only way to get back to the original performance is by physical replacement.

Frequent questions about the Redmi Note 5 battery