Why Xiaomi Redmi 9A is not charging: a full analysis of the causes and solutions

Xiaomi Redmi 9A is one of the most popular budget smartphones, but even it is not immune to charging problems. You connect your phone to the network and the indicator does not burn, the battery percentage does not increase, or the device does not respond to the charger at all? There can be dozens of reasons, from trivial contamination of the connector to serious hardware malfunctions. In this article, we will analyze all possible scenarios why the Redmi 9A stopped charging, and give step-by-step instructions for eliminating each of them.

It's important to understand that if the phone is dead and doesn't show signs of life, the algorithm will be different from when charging is going on, but very slowly (like 1% per hour). We'll look at both options, and we'll also look at the typical user errors that make the problem worse. For convenience, at the end of this article, there's a FAQ with answers to frequent questions and a charger compatibility table.

1. Checking the charger and cable: where to start the diagnosis

The first thing you need to do is eliminate power supply problems. 60 percent of the time, it's not the device itself, it's the accessories. Take the original Xiaomi charger (if it's still there) and try charging the phone. If it's not there, use the known RAM from another smartphone with similar specs (5V/2A or 10W).

Pay attention to the condition of the cable: often inflections at the base of the plug or near the USB-The connector leads to a cliff:

• 🔌 Extraneous sounds (crackles) when moving the plug
• 🔥 Melted areas or darkening of insulation
• 🧲 Magnetic field (if the cable with a ferrite ring - it should not warm up)

If you have a multimeter on hand, measure the voltage at the outlet of the charger. Redmi 9A normal readings:

• 🔋 5.0V ± 0.2V — standard voltage
• ⚡ 2.0A — Current strength (when connecting the phone can fall to 1.5A)

⚠️ Warning: Never use chargers with higher output voltage 5.5V (For example, from laptops or tablets with 9V/12V). This could knock out Redmi's power controller 9A.

2. Cleaning the connector. USB-C: hidden cause of poor charging

The USB Type-C connector in the Redmi 9A is often clogged with dust, villi from your pocket, or oxidized by moisture, leading to unstable contact when the phone is charging or not.

• 🕯️ Wooden toothpick (not metal!) – to remove large debris
• 🧴 Alcohol wipes (70% isopropyl alcohol) - for degreasing contacts
• 🔦 Lantern - to inspect the connector for damage

Cleaning algorithm:

1. Turn off the phone and remove it. SIM-memory-card.
2. Bring the flashlight to the connector and inspect the contacts for oxidation (green/white coating).
3. Carefully, without pressure, walk with a toothpick on the inner walls of the connector.
4. Moisten the napkin with alcohol and wipe the contacts (do not pour the liquid inside!).
5. Let the phone dry for 10-15 minutes before connecting the charger.

If you don't charge after cleaning, try wiggling the plug in the cable connection slightly during connection, and if the phone starts charging only in a certain position, the problem is precisely the contacts (either the phone connector or the cable plug).

3. Software failures: when firmware or settings are to blame

Sometimes the Redmi 9A doesn't charge due to software errors, not hardware failures.

• 📱 The phone is turned on but does not show the charging process
• 🔄 The swelling is in the snag (i.e., no)
• ⚡ The battery is discharged even when connected to the RMS

First, try restarting your phone in forced mode:

1. Press the power button for 10-15 seconds.
2. If the phone is not responding, press Power + Volume up for 20 seconds.

If the reboot didn’t help, reset to factory settings (data will be deleted!):

1. Go to Settings → About the phone → Reset settings.
2. Choose to erase all data and confirm the action.
3. After reset, connect the original charging and check the work.

Try another charger and cable|Reboot the phone forcibly|Check the battery settings in Settings → Battery.|Reset the settings to factory (if nothing helps)-->

If the phone is low and doesn't turn on, try recovery mode and flash it through Fastboot.

1. Connect your phone to a PC with Xiaomi drivers installed.
2. Press Power + Volume down before the Fastboot logo appears.
3. Download the official firmware for Redmi 9A from Xiaomi and run through the Mi Flash Tool.

⚠️ Attention: Fastboot wipes all data, including photos and contacts. If the phone responds to charging (vibrates, flashes the indicator), first try to pull the battery (if it is removable) or wait 30 minutes - sometimes the system "wakes up" after a deep discharge.

4.Battery problems: when to replace

The average battery life in the Redmi 9A is 300 to 500 full charge cycles, and then the capacity drops by 20 to 30 percent, and the controller can start blocking charging due to unstable voltage.

• 🔋 The phone turns off at 20-30% charge
• ⚡ Charging is only in the off state
• 🌡️ Battery warms up strongly when connecting the ZU
• 📉 Battery life has been reduced by 2-3 times

You can check the status of the battery through the engineering menu:

1. Enter the dialer code: ##4636##.
2. Select Battery Information.
3. Look at the parameters Charge level, voltage and temperature.

The following are the normal performances for the Redmi 9A:

If the battery is swollen (as seen from the raised back cover) or its capacity has fallen below 2000 mAh (originally 5000 mAh), the only solution is to replace it. It is not recommended to do this on your own - in the Redmi 9A, the battery is glued to the body, and if you unscrupulously dismantle it can damage the plumes.

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If the phone isn't charging but is powered by Power Bank, the problem may be the power supply of the outlet.Try plugging in Redmi 9A to another source (e.g, USB-port of the computer) - if charging went, the wiring is to blame.

5 Power controller failures: when the phone "cannot see" charging

The Power Controller (PMIC) is a chip on the motherboard that controls battery charging. If it fails, the Redmi 9A can:

• 🔌 Not at all to react to the charging connection
• 🔄 Cyclically turn on/off when charging
• ⚡ Show charging, but the percentage does not increase

Causes of Controller Failure:

• ⚡ Voltage surges (for example, when using uncertified RMS)
• 💦 Moisture on the board
• 🔥 Overheating (if the phone was used frequently while charging for gaming)

It is difficult to diagnose the problem on your own, but there are indirect signs:

• The phone does not charge from any cable/ROM, but it is powered by Power Bank.
• When charging, the phone vibrates, but the indicator does not burn.
• In the engineering menu, the battery voltage is 0.00V.

The solution is one – repair in the service center, in most cases, you need to replace the controller or flash it on the firmware (if the circuit is complete, but the settings are lost), the cost of repair is from 1500 to 3000 rubles depending on the complexity.

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If the phone has fallen into water or been subjected to a strong vibration (for example, in a car), first check the oxidation fee. Often, it is enough to clean the controller's contacts with alcohol to restore charging.

6.Wireless charging: why doesn't work on the Redmi 9A

Xiaomi Redmi 9A does not support wireless charging at the hardware level - it does not have a corresponding coil. However, some users try to use external adapters (for example, cases with a Qi module).

• 🔋 Adapter is not compatible with Redmi 9A (Support for Qi 1.2 is required+).
• ⚡ The power of the charging station is too high (optimally high — 5W).
• 📍 Incorrect positioning of the phone on the court (there should be a perfect match of coils).

If you want to charge the Redmi 9A wirelessly, use certified adapters, such as:

• Xiaomi Wireless Charging Receiver (connects to USB-C connector)
• Baseus Wireless Charger (with magnetic fastening)

⚠️ Note: Wireless charging via adapter will always be slower than wired charging (maximum) 5W against 10W In addition, the adapter can overheat - do not leave the phone on the charger unattended.

7.Preventing charging problems: how to prolong the life of a battery

To avoid charging problems in the future, follow these guidelines:

• 🔋 Use only original or certified cables and chargers.
• 🌡️ Do not charge your phone at a temperature below 0°C or higher than 40°C.
• 📵 Avoid full discharge – connect charging at 15-20%.
• 🔌 Do not leave your phone on charge all night (optimum - up to 80-90%).
• 🚫 Do not use your phone while charging for resource-intensive tasks (games, video).

It is also useful to calibrate the battery once every 2-3 months:

1. Charge your phone to 100% and leave it on charge for another 1 hour.
2. Turn off the charger and discharge the phone to 0% (until it turns off).
3. Connect the charging and charge up to 100% without interruptions.

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If you notice that your phone is running out quickly, check the list of running apps in Settings → Battery → Battery Use. Often the background processes of instant messengers or games that are not optimized for energy saving are to blame.

FAQ: Answers to Frequent Questions