Why Xiaomi Redmi Note 7 is charging too long: diagnostics and repairs

Xiaomi Redmi Note 7 is one of the most popular smartphones in the budget segment, but even it is not immune to problems with charging. If your device began to charge 2-3 times longer than usual, this does not always mean that the battery has fallen into disrepair. The reasons may lie in software failures, inappropriate charger or even in the settings of the system.

In this article, we’ll look at all the possible causes of slow charging, from the banal wear of the battery to the hidden MIUI features that slow things down. You’ll learn how to check the battery status, which chargers are really suitable for the Redmi Note 7, and what to do if the smartphone is warming up or refusing to charge at all, and at the end, a step-by-step checklist for self-diagnosis.

1. Battery wear: how to check and what to do

The average lifespan of a lithium-polymer battery is 300 to 500 full charge cycles. For the Redmi Note 7, released in 2019, this means that by 2026, the battery could lose up to 30 to 40 percent of its capacity when used actively. But how do you know for sure if the battery is to blame?

There are two reliable ways:

• 📊 Diagnostic code: Enter ##4636## in the Phone app, then go to Battery Information. Level will show current charge and health will show state (if the value is below 80%, it is time to change the battery).
• 🔋 Analyzer applications: AccuBattery or CPU-Z It's going to show you the actual battery capacity and the discharge rate, and if you compare it to a passport of 4,000 mAh, if you're going to have a difference of more than 1,000 mAh, the problem is obvious.

If the battery is worn out, there are two options: replace it yourself (the cost of the original battery is about 1500-2000). ₽) Or go to the service. Don't buy cheap ones, they may swell or they won't support fast charging.

⚠️ Warning: If the battery is swelling (the case of the smartphone has become convex), immediately disconnect it from charging and do not use until replaced.

2. Inappropriate charger: myths and reality

The Redmi Note 7 supports Quick Charge 4.0, but only when using an original or certified charger. Many users mistakenly believe that any 5V/2A-labeled RAM will work, but it is not.

Here's what's really important:

• ⚡ Power: the original memory from Xiaomi has parameters 5V/3A, 9V/2A or 12V/1.5A. Charges with lower values (for example, 5V/1A) will charge in 2–3 slower.
• 🔌 Cable: Even if the power supply is powerful, a cheap, thin-vein cable will limit the current. USB Type-C or certified analogues (e.g., from Anker or Baseus).
• 🔄 Port port USB: charging USB-The port of a computer or car adapter is always slower due to current restriction (usually a sluggish device). 0.5A–1A).

You can check the actual charging power using the Ampere app (showing current in milliamperes). If you connect the original RAM value below 1500 mA, the problem is in the cable or power supply.

💡

If you don’t have the original RAM, choose a power supply that supports Quick Charge 3.0/4.0 or Power Delivery (PD). These are compatible with the Redmi Note 7 and will provide top speed.

3. Software glitches: why MIUI slows charging

Sometimes the Redmi Note 7 starts to charge slowly due to firmware errors or background activity of applications.

• 🤖 Battery optimization: in MIUI There's a smart charging feature that limits current if your smartphone is connected to the network for a long time. → Battery → Settings → Optimizing charging.
• 📱 Background processes: apps like Facebook, Instagram or instant messengers can consume up to 20% charge per hour even in standby mode. → Battery → Battery utilization.
• 🔄 Firmware failures: after the update MIUI You might be losing battery calibration. Try resetting through Settings. → System system → Resetting settings → Resetting battery settings.

If the problem appears after the update, try to roll back to the previous version of MIUI or wait for the patch.

1. Download the necessary firmware version from the official Xiaomi website (section Redmi Note 7, lavender encoding).
2. Rename the file to update.zip and place it in the phone’s root folder.
3. Press Volume Up + Power, select Recovery, then Install update.zip.

⚠️ Note: Do not use custom firmware (such as LineageOS) without experience – they can disrupt fast charging and lead to overheating.

4.Overheating: Why the smartphone refuses to charge quickly

Redmi Note 7 automatically reduces the charging current if the battery temperature exceeds 40-45 ° C. This is protection against damage, but it also slows down.

• ☀️ External conditions: charging under direct sunlight or in a stuffy room.
• 🎮 Load: Games, video shooting or app updates while charging.
• 🔥 Battery malfunction: A bloated or damaged battery warms even in a simple way.

To avoid overheating:

1. Remove the case while charging (especially if it is dense or metal).
2. Do not use your smartphone for resource-intensive tasks while it is charging.
3. If the phone is heated, disconnect it from the network for 10-15 minutes to cool down.

5.Problems with USB Type-C connector: how to clean and restore

A contaminated or damaged connector is one of the most common causes of slow charging, and dust, contact oxidation, or mechanical damage can interrupt the current supply.

How to check and clean the connector:

1. Light a flashlight at the port – if dirt, dust or foreign objects are visible, they should be removed.
2. Use a plastic toothpick (not metal!) or compressed air to clean. Don't blow with your mouth - moisture from your breath can make the problem worse.
3. If the contacts are oxidized (blackened), gently wipe them with an alcohol napkin.

If the connector is shattered or bent, it will have to be replaced. The cost of repair in the service is about 1000-1500. ₽. Remember: poor quality repairs can lead to short circuits!

Check visually for dirt.

Try another cable (preferably original)

Connect the RAM to another device (to prevent its malfunction)

Estimate how tightly the cable holds in the connector (there should be no backlash)

-->

6. Hidden MIUI settings that slow charging

There are several features in MIUI that few people know about, but they directly affect the charging speed:

• 🔋 Battery Saving Mode: Limits background activity and reduces charging current. Shuts down in Settings → Battery → Battery savings mode.
• ⚡ Fast charging: sometimes shuts down after an update. check in Settings → Battery → Settings → Activate fast charging.
• 📵 Background Limitation: If Do Not Disturb or Traffic Saving mode is enabled, the system can artificially slow down charging. → Connections and sharing.

It's also worth checking the developer mode.

1. Go to Settings → About phone and 7 times click on the MIUI version.
2. Back to Settings → Additionally. → For developers.
3. Find Debugging by USB and Do not turn off the screen while charging – turning them on can affect speed.

💡

If you keep charging slowly after all the manipulations, try resetting to factory settings (Settings → System → Reset) and this will delete all the data, but it will return the original power settings.

7.When to carry to the service: signs of serious malfunction

If you’ve tried all of these, but the Redmi Note 7 still charges for 5-6 hours, the problem could be hardware.

• 🔌 Charging is interrupted: the cable is connected, then disconnected for no apparent reason.
• 🔥 Strong heating: the case becomes hot 5-10 minutes after connecting the RAM.
• ⚡ No response to charging: indicator does not burn, although the cable and power supply are serviceable.
• 📉 The battery is discharged faster than it is charged (for example, 10-15% is lost per hour of use, and only 5 are restored per hour of charging%).

The cost of diagnostics in the service center Xiaomi – about 500 ₽. Average repair prices:

⚠️ Note: If the smartphone is warranty, do not open it yourself - this will void warranty obligations.

FAQ: Frequent questions about charging Redmi Note 7