Why is the Redmi 7 charging slowly?
Owners of Xiaomi Redmi 7 often face the question: why does the smartphone support Quick Charge 3.0 technology, but it takes 2-3 hours to charge? The fact is that by default the fast charging function can be turned off in the MIUI settings or inactive due to an incompatible charger. In this article, we will discuss all ways to activate accelerated charging, including hidden settings, selecting an adapter and diagnosing problems.
It is important to understand: Redmi 7 is equipped with a Qualcomm Snapdragon 632 processor, which technically supports Quick Charge 3.0 (up to 18 watts), but the manufacturer limited the power to a standard power supply of 10 watts (5V/2A). This is a marketing move – the smartphone is capable of more, but it will require the right adapter and settings. Next – step-by-step instructions with nuances.
1. Checking the compatibility of the charger
The first step is to make sure your power adapter supports Quick Charge 3.0/4.0 or Power Delivery (PD).Redmi 7 comes with 5V/2A (10W) charging that doesn't provide accelerated charging.
- 🔌 Xiaomi’s original 18W adapters (e.g., from the Redmi Note 7 or Mi 9) will work, but require activation in the settings.
- ⚡ Third-party charging: Choose certified devices with support QC 3.0 (e.g. Anker PowerPort or Baseus).
- ⚠️ Cheap analogues: can damage the battery due to unstable voltage. UL or CE.
How to check the current charging power? Connect your smartphone to the adapter and go to Settings → Battery. The consumption schedule will show the words “Fast Charging (if active)” or specifying the current voltage values (for example, 5V/1.5A).
2. Activation of fast charging in MIUI settings
Even with a compatible adapter, the function can be turned off software. In MIUI 10/11/12, the path to settings is different:
- Open Settings → Battery and Performance.
- Slip on the battery settings (in some versions – Additional).
- Find Fast Charging (or Charging Optimization) and activate the switch.
If there's no item, then your version of MIUI is hiding it.
☑️ What to do if you do not have the option of "Fast charging"
Attention! Some firmware only has an option when you plug in a compatible adapter, and if you're using a 10W charge, it may not be available.
3. Engineering menu: hidden charging settings
For advanced users, Redmi 7 allows you to turn on Quick Charge through the engineering menu. This method only works on stock firmware without modifications!
- Open the Phone app and enter the combination: ##4636##.
- In the menu that opens, select Battery Information.
- Check the AC Charge string – if the value is False, tap it to activate it.
- Reboot your smartphone.
⚠️ Warning: Do not change other options in the engineering menu - this can lead to unstable operation of the device or overheating of the battery. If after activation the smartphone began to heat up very much, return the settings to the original state.
What to do if the engineering menu is not opened?
4. Charging optimization: What prevents fast charging?
Even with the right adapter and settings enabled, the Redmi 7 can charge slowly.
| Problem. | Reason. | Decision |
|---|---|---|
| Charging is on 5V/1A. | Use a non-original cable or adapter | Replace the cable with a certified one (e.g. USB-C from Xiaomi) |
| The smartphone is heated over 40°C | MIUI automatically reduces current to protect the battery | Charge the device in a cool place, removing the case |
| Charging "jumps" (fast, then slowly) | Background processes (games, updates) consume energy | Turn on Airplane Mode or close all applications |
| Maximum current - 1.5A at 5V | The USB port of a smartphone or adapter is contaminated | Clean the port with compressed air or a soft brush |
💡
If your smartphone charges slowly to 80% and then stops, that’s a normal feature. MIUI It's called "Optimized Charging." It extends battery life by limiting the charge to 100 percent just before you disconnect from the network. → Battery → Optimized charging.
5. Alternative methods of accelerating charging
If the standard methods did not help, try these techniques:
- 🔄 Resetting battery settings: Go to Settings → System system → Resetting settings → Resetting the battery settings. This will reset the consumption statistics and can restore fast charging.
- 📱 Disabling background processes: C Settings → Annexes → Autorun disable autorun for unnecessary programs.
- 🔋 Use Do Not Disturb Mode: Activate it while charging to minimize screen and notification power consumption.
- 🛠️ Update of the firmware: In some versions MIUI fast charging is not working properly. Check the updates in Settings → The phone. → Updating the system.
Important: If after all the manipulations, charging remains slow, the problem may be a worn-out battery. Check its condition in Settings → Battery → Battery condition. With a capacity below 80% of the original recommended replacement.
💡
Fast charging on the Redmi 7 depends on three factors: a compatible adapter (18W+), activated MIUI settings and a good battery. If at least one condition is not met, the smartphone will charge in standard mode.
6. Frequent mistakes and how to avoid them
Users often make these mistakes when trying to turn on fast charging:
⚠️ Warning: Never use chargers with higher output voltage 9V/2A, If not certified for Quick Charge 3.0. This can cause the battery to bloat or the power controller to fail, such as laptop power supplies (19V) strictly forbidden!
- ❌ Use of damaged cable: Microcracks in the squirt or bent contacts reduce current.
- ❌ Charging through USB-hub or computer: Ports USB 2.0/3.0 PCs give you the maximum 0.5–1A, what 2–4 times slower than the adapter.
- ❌ Ignoring Temperature: Charging at a Temperature Below 10°C or higher than 35°C is automatically limited MIUI.
Another common problem is false fast charging, for example, a smartphone shows Fast Charging, but the charging time does not decrease, which means that the adapter gives an increased voltage (for example, 9V), but the current remains low (1-1.5A), the solution is to use a charger with support for QC 3.0 and current from 2A.