The Xiaomi Redmi Note 8, released in 2019, remains a popular device due to its price-performance ratio, but its autonomy may decline over time. Proper operation of a lithium-polymer battery is not just a way to extend the life without recharging, but also a safety measure to prevent physical damage to the case. Many users make typical mistakes that accelerate the degradation of chemical elements inside the battery, which leads to the need for expensive replacement.
Owners often wonder whether to leave the phone on charge all night or it is better to discharge it “to zero” before connecting to the network. Modern power controllers installed in the Redmi Note 8, have protection against overcharging, but constant work at the limit of temperature regimes is detrimental. Understanding the physical processes that occur inside the gadget while connecting to the grid, will help you maintain its performance for many years.
In this article, we will examine the technical nuances of charging, the myths about “training” batteries and the specific actions that you need to perform to maintain the health of your device.We will look at the effect of temperatures, the quality of the cables used and the software settings of the MIUI system, which are hidden from the eyes of the average user.
Technical features of the Redmi Note 8 battery
The power supply of the model in question is based on a Li-Po (lithium-polymer) battery with a capacity of 4000 mAh. Unlike older nickel batteries, lithium cells do not have a “memory effect”, which makes the popular method of full discharge and subsequent long-term charge not only useless, but also harmful. Deep discharge below the critical threshold causes irreversible chemical reactions that can completely disable the device.
The smartphone supports fast charging technology Quick Charge 3.0 power of 18 watts. This means that the device can receive increased current at certain stages of the cycle, which inevitably leads to heating. Heat generation is the main problem of any electronics, as high temperatures accelerate the destruction of the electrolyte inside the battery cell. That is why the use of unoriginal power supplies, not coordinated with the phone controller, can be dangerous.
The power controller in the Redmi Note 8 automatically adjusts the current strength depending on the current body temperature and charge level. However, the system cannot fully compensate for poor external conditions, such as using the phone in direct sunlight while charging. It is important to understand that the manufacturer's declared capacity is a nominal value that can actually vary depending on the operating conditions.
Optimal temperature and operating conditions
The chemical reactions inside the Li-Po cell are most efficient and safe at temperatures between +15°C and +25°C. If you charge your phone in winter outside or in a cold room, the controller can artificially limit the charge current or even temporarily block it to prevent the deposition of the metallic lithium on the anode, which reduces the capacity.
On the other hand, overheating is even more dangerous: at temperatures above +45°C, the components begin to deteriorate rapidly. If you notice that the Redmi Note 8 body has become hot during charging, immediately stop using resource-intensive applications or remove a dense case that prevents heat exchange. In especially hot cases, it is recommended to even interrupt the charging process until the device cools down.
- 🌡️ Avoid charging in direct sunlight or on heating appliances.
- ❄️ Do not connect a cold smartphone to the network immediately after application from the cold - let it warm up to room temperature.
- 📱 Remove thick protective covers during fast charging to improve heat sink.
The processor and graphics chip emit a significant amount of heat, which is combined with heat from the charging battery, which creates a double blow to the battery resources. If you need to use a navigator in the car, try to direct the air flow from the air conditioner to the phone or use special holders with active cooling.
Rules for the use of chargers and cables
The quality of power transmission depends on the equipment used. For the Xiaomi Redmi Note 8, it is recommended to use the original adapter and cable that come with the kit, since they have the appropriate certificates of quality and resistance. Cheap counterparts from the markets often do not have proper insulation and voltage stabilization, which leads to current surges that “kill” the power controller.
Pay attention to the condition of the cable. Fractures, insulation bloating or poor contact in the USB Type-C connector lead to unstable connection. This causes micro-breaks of the circuit, in which the charging process is constantly interrupted and resumed. These cycles create additional stress on the battery and can damage the charging connector in the smartphone itself, which will require hardware repair.
| Accessory type | Recommendation | Risks. |
|---|---|---|
| Original 18W block | Perfect. | Minimum |
| Certified analogue (Anker, Baseus) | Permissible. | Low. |
| Cheap Chinese Block (No-name) | Not recommended | High (voltage surges) |
| Charging from a laptop (USB) | Safe, but slow. | Low (longer warms) |
When buying a new cable, pay attention to its bandwidth. To support fast charging, the Quick Charge cable should withstand a current of at least 2A, and ideally 3A. Visually, such cables are often thicker than normal, and inside their contacts there may be additional lines for transmitting data about the charging protocol between the phone and the power supply.
Software settings and optimization of MIUI
The MIUI system installed on the Redmi Note 8 provides users with a range of tools to monitor and manage energy consumption. In the Security section -> Battery, you can see detailed statistics on application energy consumption. Regular analysis of this report helps to identify "voracious" programs that can run in the background and cause unnecessary heating even in standby mode.
One of the useful features is memory optimization and background closure. However, do not overuse the constant closure of all applications manually - the Android system itself effectively manages resources, and constantly restarts energy applications. Better set up autorun: go to Settings → Apps → Autostart and turn off unnecessary services that you do not need immediately after turning on the phone.
Also worth paying attention to is the Night Charging Optimization feature (if available in your firmware version), which learns your habits and, if you put your phone on overnight charging, charges it up to 80% first and finishes the remaining 20% in the morning, allowing the battery to stay under high voltage less time, which has a positive effect on its durability.
- 🔋 Regularly check the statistics of battery consumption in the settings.
- 🚫 Turn it off. GPS Bluetooth, if not used.
- 📲 Remove or freeze apps you don’t use.
Myths about calibration and “training” of the battery
There are still tips on the Internet about the need to regularly discharge the phone to 0% and charge up to 100% to "calibrate." For today's lithium polymer batteries used in the Redmi Note 8, this is a misconception. Full discharge causes stress to the cell's chemistry, and constant charge to the end keeps the cells in a state of high voltage, which accelerates their aging.
Calibration of the charge controller (when the percentages on the screen do not correspond to the actual capacity) is extremely rare and only in the case of obvious software glitches, for example, when the phone turns off at 15% charge. In such cases, you can complete the procedure: discharge to turn off, charge to 100%, lie down for another hour on charging. But do this monthly “for prevention” is absolutely not necessary.
⚠️ Warning: Deep discharge (until completely shutdown and loss of ability to turn on) can lead to a voltage drop below the critical level, after which the standard charger can simply “not see” the battery and not start charging.
Modern power controllers are already calibrated in the factory, and if you notice that the phone is running out quickly or that the percentage of charging is jumping, the problem is probably the physical wear of the battery or the malfunction of the controller, not the lost software readings, in which case the software methods will not help, you will need to replace the battery.
Smartphone storage and long-term conservation
If you plan to not use the Xiaomi Redmi Note 8 for a long time (for example, leave it as a spare or sell), you need to properly prepare the device. Store a phone with a fully charged or, conversely, completely discharged battery. The optimal charge level for preservation is 50-60%.
When stored in a fully charged state, the chemical degradation processes inside the battery continue, which can lead to bloating. When stored in a discharged state, there is a risk of self-discharge below the critical level, after which the controller will lock the cell and the phone will stop responding to charging. It is recommended to check the device every 3-4 months and recharge it to the level of 50-60%.
Temperature storage is also important. The ideal place is a dry, cool place (about +15°C). Do not leave your phone in the garage, where it can be cold in winter, or in the attic under the sun. Humidity is also undesirable, as it can cause the contacts inside the device to oxidize, even if it is turned off.