Slow charging Xiaomi Redmi Note 5: causes and solution

The situation when your Xiaomi Redmi Note 5 charges suspiciously slowly, familiar to many owners of this popular smartphone. instead of the usual hour and a half, the process stretches for a whole day, and the battery indicator freezes in one place even with the cable connected, This is not just an annoyance, but a signal of potential problems in the energy saving system or hardware of the device.

The reasons for this behavior can range from banal wear of the cable to serious failures in the power controller. It is important not to ignore these symptoms, as prolonged improper charging can lead to battery degradation or overheating of the board. In this article, we will discuss in detail why slow charging is becoming the norm for your gadget and what specific steps you need to take to correct the situation.

Before you take your phone to a service center, you need to do a series of self-checks, and often the problem is with software settings or external accessories that are easy to replace or reconfigure, and we'll look at the algorithm of actions from simple software resets to complex hardware diagnostics so that you can get your device back to its previous speed.

Diagnostics of external factors and accessories

The first thing to start looking for a fault is to check the integrity of the charging cable and the power supply. Cheap wires often do not withstand the declared currents, especially if we are talking about Quick Charge technology, which requires high-quality connection of contacts. Insulation damage or a fracture inside the cable leads to a voltage drop, which causes the smartphone to go into standard rather than fast charging mode.

Pay attention to the state of affairs. USB-The pocket of the clothes often accumulates pile, dust and small debris, which prevents the plug from fitting tightly. If the cable is not inserted to the end or dangling, contact with the current tracks is lost and the charge controller limits the incoming current for safety reasons.

• 🔌 Try using the original power supply and cable that came with the device to rule out their malfunction.
• 🧹 Carefully clean the micro connector-USB wood toothpick or plastic spatula, avoiding the use of metal objects.
• 🔋 Check the charging on another outlet, eliminating the fault of the power grid in the house.
• 📱 Connect your phone to your computer: If charging is going on, but very slowly, the problem may be the strength of the port current. USB PC.

And let's not forget the temperature, because lithium-ion batteries are extremely sensitive to overheating, and if you're trying to charge your phone in the sun or in a hot room, the protection system will automatically slow down to prevent the battery from bloating or catching fire, and in these cases, thermoregulation is a priority, and it won't be able to programmatically speed up charging.

Software settings and optimization of MIUI

The MIUI operating system on the Redmi Note 5 has a variety of background processes that can consume power even when the screen is off. Sometimes a particular application hangs in the background and continues to actively use the processor, preventing the phone from going into fast charging mode, in which case the battery recharge rate will be equal to the rate of its consumption.

To detect such programs, you need to go to the settings and analyze the power consumption statistics. If you see an application that used disproportionately much energy during downtime, it should be forcibly stopped or removed, and it is worth checking for system updates, since in new versions of the firmware, developers often fix errors in power management algorithms.

⚠️ Warning: Installing unofficial firmware or obtaining superuser (Root) rights may disrupt the full-time charge controller, leading to incorrect percentage display and faulty charging speeds.

Another effective method is battery calibration. While many people think it's a myth, in some cases, resetting battery statistics helps the system re-determine the actual capacity and adjust the thresholds for fast charging, by completely discharging the phone before turning it off, then charging it to 100% when it's off, then resetting it completely (pre-saving the data).

It is useful to check whether the power saving mode is activated during charging. Sometimes users accidentally turn it on and it restricts background activity, which paradoxically can affect the display of charging speed or the operation of system services. Make sure that the battery settings choose the "Performance" or "Balanced" mode when connecting to the network.

Hardware problems: connector and plume

If software and cable replacements don't work, there's a high probability of hardware failure. The most common problem with the Redmi Note 5 is the wear of the lower charging plume. In this model, the micro-USB connector is soldered on a separate flexible board that connects to the motherboard through a plume. Over time, the contacts oxidize and the connector is loosened.

Symptoms of a bottom plume malfunction include not only slow charging, but also problems with data transmission, microphone operation and dynamic hands-free communication. Often, you need to “catch” the phone in a certain position to start charging, a sure sign that mechanical contact is broken and a replacement component is required.

Replacing the bottom plume is relatively inexpensive and fast. However, it is important to use quality components. Cheap counterparts often don't have proper brazing to support fast charging protocols, and even after replacing the phone will charge slowly. Look for plumes labeled with Quick Charge 2.0/3.0 support.

Wear of the battery and the power controller

The internal battery of a smartphone is a consumable. Over time, its capacity drops and internal resistance increases. If your Redmi Note 5 has been around for a few years, the battery may have lost a significant portion of its original capacity. The old battery cannot take charge at the same rate as the new one, as the chemical reactions inside it slow down.

Beyond the battery bank itself, the protection board (BMS) that sits inside the battery case is important, and it communicates with the phone's motherboard, reporting temperature, charge level and allowable current, and if the battery controller is faulty, it can artificially limit incoming current, which is perceived by the user as slow charging.

• 📉 Check battery wear through the engineering menu by dialing code ##6485## in the Phone app».
• 🌡️ Keep an eye on the parameter. MB_06 (residual receptacle) and MF_05 (charge-cycle).
• 🔋 If the cycles are more than 500 and the capacity has fallen below 80%, the battery replacement is mandatory.

And there's also the power controller on the motherboard, which is a chip that distributes power between the components and controls charging, and failure of this chip is a rare but possible scenario, especially if the phone falls or is exposed to moisture. Repair in this case requires professional equipment and soldering skills BGA-component.

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To extend the life of the battery, try not to discharge the phone below 15% and not to keep on charging constantly at 100%.

The Impact of Background Processes and Applications

Often, users are unaware that charging speeds are directly dependent on what happens on the screen and in the background. Running heavy games, navigation or video streaming while charging creates a situation where the energy consumption exceeds its supply, in which case the battery will charge extremely slowly or even discharge.

Special attention should be paid to “gluttonous” applications such as social networks and instant messengers, which constantly update content. Even if the screen is turned off, active data exchange via 4G or Wi-Fi consumes energy. To speed up the process, it is recommended to turn on “Flight Mode” for charging time, if you do not need incoming calls.

There's a battery optimization feature on Android that can be configured incorrectly. Check the settings for each application: maybe some of them have permission for unlimited background activity. Disabling such activity for unnecessary programs will help reduce the load on the processor and speed up charging.

⚠️ Note: Charging accelerators from the Play Market often have the opposite effect, consuming resources themselves and may conflict with system settings. MIUI.

Specificity of work USB-micro-USB port

Redmi Note 5 is equipped with a Micro-USB connector, which is obsolete compared to modern USB-C. The main feature of this connector is asymmetric and fewer contacts designed for high currents. With frequent use, the contacts inside the connector are erased, and the central tongue of the plug loses elasticity.

Fast charging protocols like Qualcomm Quick Charge use special signals on data contacts (D+ and D-) to negotiate with the charger to increase the voltage. If these contacts are contaminated or oxidized, the phone will default to safe 0.5A or 1A charging mode, which is very slow for a 4,000mAh capacity.

Special diagnostics can be used USB-They're actually showing the actual voltage and the current in real time, and if the tester is running at less than 1.5A with a powerful power supply connected, then there's no negotiation.

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The main reason for slow charging in 80% of cases is not the battery, but poor contact in the connector or poor-quality cable that does not support the desired current.