Why the Redmi Note 5 battery raises so many questions
Xiaomi Redmi Note Smartphone 5 (codename Whyred was released in 2018 And it's still one of the most popular budget devices of the brand. 4000 The battery on paper promised to 2 Autonomy Days, but through 2-3 And as the year went by, users started to notice that the charge was getting worse, so how much battery life is actually in this model -- and could it be "reanimated"?
The manufacturer claims 500 full charge cycles to reduce capacity to 80%, but the real tests show different numbers.
- 🔋 Official and real data on the life of the battery
- ⚡ How charging cycles, temperature and chargers affect wear
- 🛠️ When is the time to change the battery and how much does it cost?
- 📊 Comparison with other Redmi models and POCO durablely
Spoiler: If your Redmi Note 5 runs out in 4-5 hours with moderate use, that's not the norm, it's a signal to replace the battery. But first, let's get a sense of why.
Official data vs reality: how many cycles the battery can withstand
The technical specifications of the Xiaomi Redmi Note 5 include a 4,000 mAh lithium polymer battery with Quick Charge 3.0 (up to 18W) fast charging support. The manufacturer guarantees 80% capacity after 500 full cycles – but this is in ideal laboratory conditions.
The real-world tests (including data from service centers and XDA Developers enthusiasts) show a different picture:
- 📉 After 300-400 cycles, capacity drops to 70-75% (with active use of fast charging).
- 🌡️ With constant operation in the heat (>30°C) or in cold weather (<0°C) wear is accelerated by 20-30%.
- ⚡ The use of non-original chargers reduces the service life of 100-150 cycle.
| Conditions of operation | Duration of service (cycles) | Preserved capacity after 2 years |
|---|---|---|
| Perfect (20-25°C, original RAM, charge 20-80%) | 450-500 | 80-85% |
| Average (room temperature, mixed ZU) | 300-350 | 65-70% |
| Extreme (heat / frost, cheap ROM, discharge in 0%) | 200-250 | 50-60% |
⚠️ Note: If you are using Redmi Note 5 as a navigator in a car (constant charging) + heating, the battery may fail after 1,5-2 And then you have to replace it in a year, even if it's a small number of cycles.
💡
To check the number of charging cycles, install the AccuBattery (Android) app or use the engineering menu: type ##4636## → “Battery Information”.
How to check the wear of the battery: 3 reliable ways
Before you run to the service, check the battery status yourself. Here are three working methods for the Redmi Note 5:
- From the engineering menu: Open the Phone app and type ##4636##. Select Battery information. See health. Good is normal, Unknown, or <60% is critical.
- AccuBattery application: 📱 Install from Google Play and let 2-3 calibration cycle. 📊 In the Health section, see the actual capacity (for example, 3200 m.h. 4000). ⚡ Pay attention to the rate of wear (% per month).
- Autonomy test: 🔋 Charge the phone before 100% and disconnect from the network. 📵 Transfer flight mode, turn it off. Wi-Fi/Bluetooth. ⏱️ Set the discharge time to 0% Normal for a new battery — 40-50 If less than a few hours. 12 Watch: The battery is critically worn.
⚠️ Note: If you see a voltage below 3.5 V at 20% charge, when checking through the engineering menu, it is a sign of deep discharge).
Make a data backup|Check the status of the battery in AccuBattery|Buy the original battery (article) MBJ407200)|Prepare tools (suction cup, mediator, glue) B-7000)|Remove the pattern lock/password (in case of resetting)-->
Top.-5 The reasons for the rapid wear of the Redmi Note battery 5
Why do some users have a battery that lasts 4 years and others fail in a year?
- 🔥 Overheating: Playing in PUBG or Genshin Impact when charging = heat-up 45-50°C. Each hour of such operation reduces the service life of 1-2 cycle.
- ❄️ Storage discharged: If you leave your phone on a shelf with 0% charge for a month, the battery can swell or lose up to 30% of capacity.
- ⚡ Fast charging. 24/7: Continuous use of Quick Charge 3.0 (especially cheap adapters increase the wear on the 15-20%.
- 📶 In low-course areas (metro, basement), the phone spends up to 30% of its charge searching for the network – this speeds up discharge cycles.
- 🔄 Deep discharges: Regular discharge to 0% pre-load 100% kills the battery 200-250 cycles (instead of cycles) 500).
A combination of several factors is especially dangerous, for example, if you:
- Play a heavy game in the sun (heating + load).
- Connect a cheap charger to 5V/2A (insufficient power → overheating of the controller).
- Bring to the discharge to 5% and immediately put on charging up to 100%.
In this case, the battery will last no more than a year.
What is the memory effect and is it dangerous for the Redmi Note 5?
When to change the battery: 7 warning signs
If you notice at least three of these symptoms, it’s time to think about replacing them:
- 🔋 Phone's running out of power. 3-4 Standby hours (without active use).
- 🔌 When connecting a charge, the percentage of charge “jumps” (for example, from 30% to 50% and back).
- 📱 The body swelled (see the gap between the screen and the frame or the "slamming" display when pressed).
- ⚡ The phone goes off when 20-30% The level of charge, although it shows normal levels.
- 🔥 The battery warms up strongly even with a simple charge (temperature above 40).°C).
- 📉 AccuBattery’s real capacity is below 2500 mAh (60% of the original capacity).
- 🚨 When charging, the phone restarts or turns off on its own.
⚠️ Warning: If the battery is swelling, you can't try to charge it or use the phone. You can't try to charge it or use the phone. You can risk fire or explosion.
The cost of replacing the battery in Redmi Note 5 (2026):
- 🛠️ Original battery (article) MBJ407200) — 1500-2000 ₽.
- 🔧 Installation in the service — 1000-1500 ₽ (hull-free).
- 💰 Totally — 2500-3500 ₽ (depending on the region).
💡
Replacement of the battery in Redmi Note 5 is better done in the official service Xiaomi - they use the original battery with the correct calibration of the controller. "Left" workshops often put cheap analogues that serve 2 times less.
How to extend the life of the battery: 8 working tips
If the battery is not in critical condition, these measures will help slow down the wear and tear:
- Keep the charge between 20% and 80% Lithium polymer batteries are the worst tolerated deep discharge (0%) and full charge (100%). Optimal range is 20-80%. Use AccuBattery to track cycles.
- Avoid overheating. 📵 Do not play heavy games while charging. 🚗 Do not leave your phone in the sun (for example, on a torpedo). 🔥 If the case is hot, remove the cover and let it cool.
Use the original charger
Cheap RAMs are unstable, causing the battery to overheat.The original Xiaomi (18W) adapter costs a lot. ~1000 ₽ — It's cheaper than a new battery.
Turn off unnecessary background processes
Go to Settings → Battery → Battery → Battery Use and disable auto-start for unnecessary applications (especially instant messengers and social networks).
4 more tips in the spoiler:
Additional ways to extend the life of the battery
⚠️ Warning: Don't believe the myths of "overclocking" a battery with multiple cycles of full discharge. - For the Redmi Note 5 This is harmful - each deep discharge reduces the service life of the 1-2 cycle.
Comparison with other Xiaomi models: who keeps the longer
What does the Redmi Note 5 look like compared to other popular Xiaomi models in terms of battery life? We analyzed data from service centers and tests:
| Model | Capacity (mAh) | Average service life (cycles) | Saved capacity after 2 years (%) |
|---|---|---|---|
| Redmi Note 5 | 4000 | 300-350 | 65-70 |
| Redmi Note 4X | 4100 | 400-450 | 70-75 |
| POCO F1 | 4000 | 250-300 | 60-65 |
| Redmi Note 8 Pro | 4500 | 350-400 | 70-75 |
| Mi A2 | 3010 | 200-250 | 55-60 |
Interesting observations:
- 📊 Redmi Note 4X Despite the less optimization MIUI It keeps the battery longer thanks to the cooler Snapdragon 625 processor.
- 🔥 POCO F1 Loses due to aggressive cooling (liquid system removes heat from the processor, but heats the battery).
- ⚡ Redmi Note 8 Pro wins with a more modern charging controller, but its 4500 mAh loses capacity faster when used intensively.
The Redmi Note 5 is in the mid-range for longevity, and will last longer than flagships (Mi 8, Mi 9) but less than long-range models like the Redmi Note 4X.