Xiaomi Redmi 8: all about the battery – capacity, operating time and secrets of long-term autonomy

Why the Redmi 8 battery raises so many questions

The Xiaomi Redmi 8, launched in 2019, is still a popular budget device due to its balanced performance and reliable battery, but it is the battery that is often the subject of controversy: some users praise it for its long work, others complain about the fast discharge.

The fact is that the actual autonomy depends not only on the declared capacity, but also on the firmware version, intensity of use, battery condition and even temperature conditions. 8, compare them with competitors, learn to check wear and give practical tips on how to extend the life of the battery on the battery 20-30% longer.

Spoiler: If you think the 5,000mAh in the Redmi 8 is a guarantee of two days of uncharging, you're wrong. But with the right settings, even this budget guy might surprise you!

The official characteristics of the battery Redmi 8: what says Xiaomi

According to the manufacturer, the Xiaomi Redmi 8 is equipped with a lithium-polymer battery capacity of 5000 mAh (milliamp-hours), which is one of the key arguments in favor of the model: at the time of release (October 2019), such batteries were rare in the budget segment.

There are some things that Xiaomi doesn’t mention:

  • 🔋 Battery type: non-removable, soldered into the case (replacement is possible only in the service center).
  • 🔌 Fast charging: Quick Charge 3.0 is supported, but a 10W adapter comes with a package (18W).
  • ⚡ Technology: The system is used MIUI Battery Optimization, which automatically limits the background activity of applications.
  • 📉 Degradation: After 500 full charging cycles, the capacity decreases by ~20% (standard for Li-Po batteries).

It's important to understand that 5,000 mAh is the rated capacity. The actual available capacity is always lower due to protective controllers and charging/discharge losses. For example, in tests with full discharge before the device is turned off, users are recording the data. ~4800-4950 mAh.

📊 How often do you charge the Redmi 8?
Every day.
In a day.
Every 2-3 days
Less than once every 3 days

Real working hours: tests and user reviews

The claimed autonomy is one thing, the actual tests are another. Let's take a look at how much the Redmi 8 actually holds in different use cases.

Independent tests (including data from GSMArena and the GSMArena and the DXOMARK), The smartphone shows the following results:

  • 📞 Mode of conversation (3G): Up to 32 hours (with full charge).
  • 🌐 Surfing the Internet (Wi-Fi): ~15-17 hours.
  • 🎮 Games (PUBG Mobile, medium settings: 6-8 hours.
  • 🎥 Video playback (YouTube, medium brightness): up to 20 hours.

Use case scenarioWorking hours (hours)Notes
Social networks (Facebook, Instagram)10–12With active use of messengers
Navigation (Google Maps, GPS)8–10With the mobile internet on
Standby mode (one) SIM, Wi-Fi)48With minimal activity
Photography (camera 12 MP)4–5Continuously shooting

User reviews on forums (4PDA, Mi Community confirms that with moderate use (calls, instant messengers, games), the smartphone easily survives to the evening of the second day. 4K, The battery goes down in 6-8 hours.

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To check the actual battery consumption, go to Settings. → Battery → Using the battery and looking at which apps consume the most power, often not games, but the background processes of messengers or social networks are to blame.

How to check the status of the battery Redmi 8: step-by-step instructions

If your Redmi 8 is running out too quickly, the first thing you need to do is evaluate the battery status. Here are 3 reliable ways to do it without special tools.

Method 1: Built-in statistics MIUI

MIUI Provides basic information about the battery:

  1. Open the Settings. → Battery.
  2. Put it on the icon. ⚙️ (gear) in the upper right corner.
  3. Select Battery Status (some firmware may not have this item).

Here you will see the approximate percentage of wear (if it exceeds 20%, it is time to change the battery).

Method 2: Engineering menu code

For more detailed diagnosis:

  1. Open the Phone app.
  2. Enter the combination: ##4636###.
  3. Go to the Battery Information tab.

Here's the display:

  • 📊 Charge level (percentage and mV).
  • 🔋 Temperature (optimum 25-40)°C).
  • ⚡ Voltage (normal for Li-Po: 3.7-4.2 V).

Check the percentage of wear in the settings MIUI|

Use the code #4636## for more information|

Compare voltage to normal (3.7-4.2 V)|

Estimate the temperature (above 45)°C - critical value)-->

Method 3: Monitoring applications

If the first two methods are not enough, install one of the applications:

  • 📱 AccuBattery (shows real capacity, charging cycles, discharge rate).
  • 🔍 CPU-Z (Battery tab displays technical data).
  • 📊 GSam Battery Monitor (analyzes application spending).

What to do if the engineering menu is not opened?
If nothing happens after entering the #4636### code, then 1. Your firmware blocks the engineering menu (often on global versions). MIUI). 2.Try the alternative code: ##2846579## → ProjectMenu → Background Settings → Battery Log. 3. If it doesn't work, use third-party apps (see Method 3).

Top.-5 The causes of rapid battery discharge and how to eliminate them

If your Redmi 8 runs out in a few hours, it's not always the battery that's to blame. Here are the most common reasons and ways to address them.

⚠️ Warning: If the battery is swelling (the body of the smartphone is deformed), DO NOT try to charge the device! This is dangerous - the battery may ignite.

Reason 1: Background activity of applications

Many programs continue to run in the background even when you're not using them, especially to blame:

  • 📱 Messengers (WhatsApp, Telegram, Viber).
  • 🌐 Social networks (Facebook, Instagram, TikTok).
  • 🎮 Games with online communities (PUBG, Clash of Clans).

Decision:

  1. Go to Settings. → Annexes → Permits → Autostart and disable Autostart for unnecessary programs.
  2. B Settings → Battery → Battery Optimization Select Limit Background Activity.

Reason 2: Too bright a screen.

Redmi 8 display (6.22 inches, HD+) It consumes up to 30 percent of the charge at maximum brightness. Even if you don't notice, automatic adjustment often overstates the brightness.

Decision:

  • 🌓 Set the manual brightness to 40-50%.
  • 🔄 Turn off Adaptive Brightness in Settings → Display.
  • ⏱️ Set the screen timeout for 15–30 seconds.

Reason 3: Poor network coverage

If the smartphone is constantly looking for a network (for example, in the subway or outside the city), the module 4G/LTE consume 2–3 surge.

Decision:

  • 📶 Switch to the switch. 3G In Settings → SIM-maps and mobile networks → Preferred type of network.
  • ✈️ Turn on Flight Mode in Unconnected Areas.

Reason 4: Outdated firmware

Xiaomi regularly optimizes power consumption in updates MIUI. If you haven’t updated in a long time, the battery may run out faster due to bugs.

Decision:

  1. Check the updates in Settings → About Phone → System Update.
  2. If there are no updates, install the latest version. MIUI manually via the Mi Flash Tool (instructions for 4PDA).

Reason 5: Battery wear and tear

If the smartphone is used for more than 2 years, the battery capacity may have decreased by 30-40%. Check the wear (see section above) and replace the battery if necessary.

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The most common reason for fast discharge is a combination of background processes and high screen brightness. Turning off auto-start applications and reducing brightness by up to 50% can increase the running time by 25-30%.

How to extend the life of the battery Redmi 8: expert advice

The Redmi 8 battery can run 500 to 800 full charge cycles, and then it starts to drop markedly, but with proper care, that can be extended to 1,000.+ Here are 7 proven methods.

Advice 1: Proper charging

Li-Po batteries don’t like extreme conditions.

  • 🔌 Do not discharge to 0% (optimally - 20-80%).
  • ⚡ Don’t keep on charging all night (use smart sockets with a timer).
  • 🔥 Avoid overheating (do not charge in direct sunlight).

Advice 2: Optimization MIUI

MIUI It has built-in tools to save charge:

  1. Enable Supereconomic Mode in Settings → Battery (disables background processes).
  2. Activate Battery Optimization for individual applications.

Advice 3: Disabling unnecessary functions

Functions that strongly plant the battery:

  • 📍 GPS (Turn it off if you are not using navigation).
  • 🔄 Auto-Update Apps (Configure only with Wi-Fi).
  • 📶 Search Wi-Fi/Bluetooth background.

Advice 4: Battery calibration

If the smartphone suddenly turns off at 20 to 30 percent charge, it may be calibration impaired to reset the data:

  1. Unload the phone before it turns off.
  2. Charge to 100% without interruption.
  3. Repeat 2-3 times.

⚠️ Warning: Don't use "accelerated charging" (fast charging) all the time - this shortens battery life. Quick Charge 3.0 is convenient on trips, but for daily use it's better to charge with a standard 10W adapter.

Advice 5: Temperature regime

The optimum temperature for Li-Po batteries is 10-35°C. Avoid:

  • 🔥 Overheating (do not leave your phone in the sun or near heating appliances).
  • ❄️ Hypothermia (do not use in the cold below) -10°C).

Advice 6: Use of original accessories

Cheap cables and adapters can damage the charging controller, leading to rapid battery degradation.

  • 🔌 Xiaomi’s original adapter (or Quick Charge 3.0 certified).
  • 📱 Cable with support USB Type-C (without damage to insulation).

Tip 7: Regular discharge to 40%

If you keep your phone without using it (like a spare phone), discharge it to 40% and turn it off. This will slow down the degradation of long downtime.

Redmi 8 battery replacement: when you need it and how much it costs

If all the tips don't work and the battery lasts less than 4-5 hours, it's time to think about replacing.

Signs that the battery needs to be changed

Pay attention to these symptoms:

  • 🔋 The phone will run out in 2-3 hours without active use.
  • 📉 In the settings MIUI wearable >30%.
  • 💥 The body swelled (seen by the gaps between the screen and the frame).
  • ⚡ The charge is jerky (fast, then slow).
  • 🔌 The phone turns off at 20-30% charge.

Cost and where to replace

Prices for replacement of the Redmi 8 battery in 2026:

Replacement optionCost (rupe)PlusesCons
Official Xiaomi service2500–35006 months warranty, original batteryLong (3-7 days), expensive
Informal service1200–2000Fast (1-2 hours), cheaperRisk of a non-original battery
Self-sustaining replacement600–1000 (battery itself)Minimum costsHard, risk damaging the plumes.

Where to buy the original battery:

  • 🛒 Official Mi Store (article: MBJ4064).
  • 🌍 AliExpress (Look for Ranked Sellers) >98% of the reviews and original details).
  • 🏬 Local parts stores (check certificates).

⚠️ Note: When replacing yourself, use a plastic mediator to separate the battery – metal tools can puncture the battery and cause a fire. Also be sure to disconnect the phone from charging 12 hours before replacing (the battery should be discharged to 20-30%).

Step-by-step instructions for replacement

If you are changing your battery, follow this algorithm:

  1. Turn off the phone and remove it. SIM-map.
  2. Heat the back cover with a hair dryer (temperature ~60°C) to soften the glue.
  3. Carefully tuck the lid with a plastic spatula (start at the corner next to the volume button).
  4. Unscrew 10 screws (use a screwdriver) T3).
  5. Disconnect the battery plume (it is under the protective film).
  6. Tap the battery with a plastic mediator and carefully remove it.
  7. Install a new battery, plug in the plume and assemble the phone in reverse order.

What if the battery is not charged after replacement?
If after installing the new battery, the phone does not turn on or charge: 1. Check the connection of the battery plume (it should sit tightly in the connector). 2. Make sure that the contacts are not bent and oxidized (clean with alcohol if necessary). 3. Try charging the phone with another cable / adapter. 4. If nothing helps, perhaps the charging controller on the motherboard is damaged - contact the service.

Frequently Asked Questions (FAQ)

How long does the Redmi 8 charge from 0 to 100%?
Charging time depends on the adapter: 🔌 Standard 10W adapter (from the kit): ~2.5–3 hours. ⚡ Quick Charge 3.0 (18 W): ~1.5 hours to 2 hours. 🐢 Charging from USB-Computer port: 4-5 hours. Tip: to speed up charging, turn on Flight Mode - this will reduce the load on the processor.
Can I use the power bank to charge the Redmi 8?
Yeah, but there's nuance: ✅ Power Bank with Quick Charge 3.0 support USB-PD. ❌ Avoid cheap Chinese banks without protection – they can damage the charging controller. 🔋 Optimal power bank capacity: 10,000–20,000 mAh (enough for 2–4 full chargers) Example of reliable models: Xiaomi Mi Power Bank 3 Pro, Anker PowerCore 20100.
Why does Redmi 8 warm up when charging?
Heating to 40-45°C when charging is normal, but if the phone gets hot (above 50)°C, check it out: 🔌 Adapter and cable: Use original accessories. 📱 Background Processes: Close all applications before charging. 🌡️ Ambient temperature: Do not charge under direct sunlight. 🔋 Battery status: If it swells, replace it. If the heating is accompanied by a large drop in charge (for example, from 50% to 10% per hour), this is a sign of a malfunction of the power controller - contact the service.
How to Reset Battery Consumption Data in MIUI?
If the battery consumption statistics show incorrect data (for example, 100% consumption on the "System"), reset: Go to Settings → Annexes → Application management. Press three dots (⋮) In the top corner, select Reset battery statistics. Reset your phone. After the reset, the data will start to be collected again. For accurate statistics, use your phone for 1-2 days as normal.
Can I use the Redmi 8 with a non-original battery?
You can, but with reservations: ✅ Pros: cheaper than the original (from 500 rubles), quickly installed. ❌ Cons: Lifespan is 1.5-2 times shorter (200-300 cycles instead of 500); the risk of bloating or overheating (especially in cheap Chinese counterparts); may not support fast charging. 🔍 Tip: If you decide on a non-original, choose a battery marked with a Grade A and a check for warranty.