The battery is the heart of your Xiaomi Redmi Note 8T, which not only affects battery life, but also the overall stability of the smartphone. After 1.5-2 years of active use, battery capacity can decrease by 20-30%, leading to sudden shutdowns, slow charging and overheating. But how do you know exactly what condition your Redmi Note 8T battery is in? Because battery performance drops gradually, and users often do not notice problems until they become critical.
In this article, we’ll look at 5 proven ways to diagnose a battery, from hidden engineering menus to specialized applications, how to interpret mAh, voltage and health, and what to do if the battery is worn out by 50% or more. Special attention will be paid to the unique feature of the Redmi Note 8T: Its battery at 4000 mAh has protection against deep discharge, but it is sensitive to temperature changes - this directly affects the test results.
1. Check through the engineering menu (#4636##)
The fastest way to get data about a battery is to use a hidden engineering menu, which is available without root rights or additional applications, but requires care: do not change the settings unless you are sure of their purpose!
To open the menu:
- 📱 Open the Phone app** and enter the combination: ##4636##.
If the Health field says "Unknown" or "Replace soon" it is a signal of critical wear, also an alarm if the voltage at 100% charge is below 4.0 V or the temperature is above 45 ° C without load.
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If the engineering menu does not open, try entering the code through the Calculator app** (enter the combination of numbers and press "=").
⚠️ Warning: Do not click on other tabs on the engineering menu (for example, "Usage statistics" or "Wi-Fi information") if you do not understand their purpose. Incorrect changes can lead to malfunctions in the smartphone.
2.Use of the AccuBattery application: detailed analysis
AccuBattery is one of the most accurate battery monitoring applications that shows real capacity, discharge rate and history of charging cycles, and has the advantage of adapting to the Xiaomi Redmi Note 8T with MIUI firmware features.
How to use:
- Download AccuBattery from Google Play.
- Launch the application and provide access to the battery data.
- Connect your smartphone to charge and wait for 100%. AccuBattery will automatically measure the real capacity.
- Go to the Health tab** – here you will see the percentage of wear.
Example of data decryption for Redmi Note 8T:
| Parameter | Norma. | An alarm signal. |
|---|---|---|
| Real capacity. | 3800-4,000 mAh | Less than 3,000 mAh (wear >30%) |
| Standby discharge speed | 0.5-1% per hour | More than 2% per hour |
| Temperature during charging | Up to 40°C. | Above 45°C. |
| Full charge time. | 1.5–2 hours (with original RAM) | More than 3 hours. |
Charging only with original cable and adapter | Avoid discharge below 20% |Do not use your smartphone when charging |Battery bloating check-->
AccuBattery also shows an estimate of the remaining battery life in years, which helps you plan a replacement, for example, if the app says “1 year”** at current wear and tear of 35%, you should consider buying a new battery.
3. Visual inspection: when the battery requires urgent replacement
Some problems with the battery Redmi Note 8T can be detected without software — just look carefully at the smartphone.
- 🔋 Battery bloating: if the smartphone case becomes convex and the screen "steps away" from the frame - this is a critical signal!
- 🔥 Overheating: If the back cover heats up to >45°C without load (e.g. when watching video), this indicates degradation of battery cells.
- ⚡ Uneven charging: the smartphone shows 100%, but suddenly turns off at 30-40.
- 🕒 Increased charging time: If the battery used to charge in 1.5 hours, now it takes 4 hours+ One hour, the capacity dropped by at least 50%.
For visual verification:
- Place your smartphone on a flat surface (such as a table).
- Easy to tap on the center of the back cover - if it "bends" or a crunch is heard, it's a sign of bloating.
- Illuminate the flashlight at the junction of the screen and the case: if a gap of > 1 mm is visible, the battery is deformed.
What to do if the battery is swelling?
⚠️ Note: If you find bloating after visual inspection, do not attempt to lower the battery (for example, puncture it). Lithium polymer batteries emit toxic gases when damaged and can ignite.
4.The test through ADB: producer
For advanced users, there is a way to get accurate data from the battery controller via ADB (Android Debug Bridge), an official tool from Google that allows you to read service information directly from the power management chip.
Instructions:
- Install. ADB-PC drivers.
- Turn on "Debugging by" USB»** on your smartphone: go to Settings → The phone. → Version. MIUI (Press 7 times to activate Developer Mode, then in Settings → Additionally. → For developers → Debugging by USB.
In the answer, pay attention to the following lines:
level: 85
voltage: 3987
temperature: 320 (32.0°C)
current now: 1200000 (1200 mA)
charge counter: 3200000 (3200 mAh)
health: 2 (Good)
technology: Li-polymerTranscript for Redmi Note 8T:
- charge counter is the current real capacity. Compare that to a 4000 mAh passport.
- Health: 2 - battery status (2 = good, 3 = average, 4-6 = needs replacement).
- current now is charge/discharge current. <1000 MA, cable or adapter malfunction.
Once a month|Six months|Only when problems arise|Never checked.-->
5. Alternative applications: Battery Guru and CPU-Z
If AccuBattery seems complicated, you can use simpler utilities, which are less accurate, but give a general idea of the battery status.
Battery Guru (from Clean Master)
- 📊 Shows a percentage health score (e.g., “85% is normal»).
- 🔋 Displays screen time and background processes that consume charge.
- 📉 Builds discharge schedules for a week/month.
CPU-Z (Battery tab**):
- 🔢 Shows accurate data on voltage, temperature and charge level.
- 📱 Supports all Xiaomi models, including the Redmi Note 8T.
- 🔄 Updates data in real time.
The main disadvantage of these applications is that they do not take into account the calibration of the controller in the Redmi Note. 8T. So they can be 5 to 10 percent different from the real thing, and for an accurate diagnosis, it's better to combine them with a different set of different things. ADB or AccuBattery.
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Applications like Battery Guru and CPU-Z are good for quick checks, but they don't replace full diagnostics. Use AccuBattery or ADB for accurate data.
When to change the battery: criteria for the Redmi Note 8T
Even if the battery is "holding" charge, it doesn't mean it's in good condition. Here are 5 signs that the Redmi Note 8T battery needs to be replaced:
- Capacity <3000 mAh (according to AccuBattery or ADB).
- Active mode (screen + mobile Internet) <3 hours.
- The swelling of the body (even minimal).
- Spontaneous reboots at a charge level of 20-30%.
- Temperature >50°C when charging or playing.
Cost of battery replacement in service centers:
| Type of service | Cost (rupe) | Guarantee |
|---|---|---|
| Official Xiaomi service | 2500–3500 | 6–12 months |
| Unofficial repairs (original battery) | 1800–2500 | 3–6 months |
| Informal repairs (analogue) | 1200–1800 | 1-3 months |
When choosing a service, pay attention to:
- 🔧 Battery type: original (Xiaomi with hologram) or analogue.
- ⚡ Calibration after replacement: the wizard must reset the controller data through MI Flash Tool.
- 📋 Guarantee: minimum period of 3 months.
⚠️ Warning: After replacing the battery, the first 3 charging cycles are performed according to the 3x3 rule: - Charge to 100% and discharge to 3% three times in a row. - Do not use your smartphone while charging. - Avoid extreme temperatures (below 10)°C or higher than 35°This will help the new battery to “swing” and last longer.