How to check the battery status on Xiaomi Redmi Note 8: the complete guide

The battery is one of the most vulnerable components of the Xiaomi Redmi Note 8, which over time loses capacity and discharges faster. If your smartphone starts to turn off at 20-30% charge, overheats during charging or requires recharging several times a day, these are sure signs of battery wear. In this article, we will discuss all the available ways to check the battery status on the Redmi Note 8, including hidden engineering menus, special applications and analysis of device behavior.

It is important to understand that even with careful use, lithium polymer batteries degrade after a long time. 300-500 The manufacturer is laying down the resource for the charging cycles. 2-3 It's a year of active use, but the actual life span depends on a lot of factors, the temperature, the quality of the charger, even the user's habits, and we're going to show you how to accurately measure battery wear without disassembling the phone or the hardware.

1. Verification through the engineering menu (USSD codes)

The fastest way to get data about a battery is to use hidden service commands. USSD-codes that will display technical information about battery status, voltage and temperature.

Open the Phone app and enter the following combinations:

• 🔢 ##4636## is the Android core test menu. Go to the Battery Information tab, which displays charge level (Level), voltage (Voltage), temperature (Temperature) and state (Health.
• 📱 ##6484## is a hardware testing menu. Select Battery Test to check capacity. Here you can see the actual battery capacity in mAh, which is often underestimated by system settings.
• ⚡ ##64663## is an alternative code for diagnosing the battery, showing detailed information about charging cycles and current current.

If the Health section says Unknown or Replace soon, it means critical battery wear. Also note the voltage: normal values for the Redmi Note 8 are 3.7-4.4 V when fully charged. If the voltage is below 3.5 V, the battery needs to be replaced.

⚠️ Attention: Do not enter randomly USSD-Some combinations (e.g. #7780##) can reset your phone to factory settings.

2. Use of diagnostic applications

If the engineering menu didn't give you enough information, you can use third-party utilities, which provide more detailed statistics, including discharge schedules, number of charging cycles, and a percentage of wear.

The best apps for Xiaomi Redmi Note 8:

• 📊 AccuBattery analyzes the actual battery capacity, shows the discharge rate and recommends optimal charging levels to extend the life of the app takes into account design capacity and estimated capacity).
• 🔋 Battery Guru – monitors the temperature of the battery in real time, prevents overheating and shows detailed statistics on charging cycles.
• 🛠️ CPU-Z — Battery displays technical parameters: charge level, voltage, temperature and battery technology (Li-Po for Redmi Note 8).

For accurate diagnosis:

1. Install one of the applications (recommended by AccuBattery).
2. Fully charge your phone to 100% and disconnect from the network.
3. Use your smartphone as normal until the charge drops to 15-20%.
4. In the app, check the Health section – it will show the percentage of wear (for example, Health: 85% means a loss of 15% of capacity).

If the wear exceeds 30-40%, the battery is considered severely degraded, in which case, even after full charging, the phone will run much less than the stated time.

3. Analysis of working hours and signs of wear

Even without special tools, you can assess the state of the battery by indirect signs.

For an objective assessment, check the phone’s operating time in different scenarios:

• 📵 Standby mode: with 100% Disable mobile data and Wi-Fi. Normal is a loss. 1-2% If the discharge goes faster, the problem is background consumption or battery.

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If the phone is running too fast, try calibrating the battery: fully discharge it before turning it off, then charge it to 100% without interruption. Repeat the procedure 2-3 times. This will help to reset the errors of the charge controller.

Verification through MIUI (built-in tools)

The MIUI firmware on the Redmi Note 8 includes built-in battery monitoring tools that are less accurate than third-party applications, but allow you to quickly evaluate basic parameters.

How to check:

1. Go to Settings → Battery and Performance → Battery Status
2. Here you will see the consumption chart for the last day / week, as well as a list of applications that consume the most energy.
3. Click on the icon. ⚙️ (The gear) in the upper right corner and select Battery Use, which shows the screen life and total battery life.

Note the Battery Health section (not available on all MIUI versions) If it says Normal, battery is fine, messages like Replacement or Severe Wear suggest you need to contact a service center.

MIUI also has a feature called Ultra-Economic Mode, which extends the battery life at a critical charge level, and if the phone goes into that mode at 30-40%, it's a sign that the actual battery capacity is well below the declared one.

5. Multimeter test (for advanced users)

If you're willing to go beyond software diagnostics, you can measure the actual battery voltage with a multimeter, which requires disassembling the phone, so it's only suitable for advanced users.

Step-by-step:

1. Turn off the Redmi Note 8 and remove the back cover (a plastic shoulder blade or mediator will be required).
2. Disconnect the battery plume from the motherboard.Battery contacts are usually labeled: + (plus), - (minus) and BAT_TEMP (temperature-sensor).
3. Connect the multimeter probes to the + and - contacts in DC (DC) mode.
4. Compare the readings with the table:

If the voltage at 100% charge is below 4.2 V, the battery is worn out. Also check the internal resistance: if it exceeds 200 mOhm, the battery cell has degraded.

⚠️ Warning: Disassembling the phone will void the warranty! If you are not sure about your skills, contact the service center. Also, do not short-circuit the contacts of the battery - this can lead to fire.

6. When is it time to change the battery?

Even if the diagnosis shows wear and tear, it doesn't always require immediate replacement, and here are the criteria for considering buying a new battery:

• 🔄 Capacity below 60% of the factory (for Redmi Note 8 is less than 2500 mAh from the original 4000 mAh).
• ⏱️ The working time was cut in half: instead of 8-10 For hours, the phone holds the charge. 3-4 hour.
• 🔥 Overheating during charging (above 45)°C) or spontaneous shutdowns.
• 📉 Nonlinear discharge: the phone is dramatically losing 10-15% charge in minutes.
• 🚫 Charging errors: messages such as Not original charger when using native RAM.

The cost of replacing the battery with the Redmi Note 8 in official Xiaomi service centers is 1500-2500 rubles (depending on the region). Self-replacement will cost less (about 800-1200 rubles for the original battery), but requires care.

When choosing a new battery, pay attention to:

• 🏷️ Article: Original battery for Redmi Note 8 is labeled MB-J11 or BM47.
• 🔋 Capacity: must be at least 4000 mAh (sometimes there are counterfeits for 3,500-3800 mAh).
• 🛡️ Controller availability: quality batteries have built-in protection against overcharging and short circuit.

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If you decide to replace the battery yourself, be sure to use plastic tools and an antistatic bracelet. Metal screwdrivers can damage the plumes, and static electricity can disable the motherboard.

FAQ: Frequent questions about the Redmi Note battery 8