The 2019 Xiaomi Redmi Note 8 Pro was a hit with a powerful processor and an advanced camera. However, for today’s users, accustomed to super-fast power-up rates, the question of how many watts a standard charger produces remains critical, and it depends on how quickly you can return to active use after connecting to the network.
As standard, which was supplied in retail boxes at the start of sales, the manufacturer provided a power adapter with support for Quick Charge 3.0 technology. This means that the rated power of the unit is 18 watts. This figure was the standard for the middle segment at the time of release of the device, providing a balance between heating speed and charging time.
But there's a big caveat that not all owners know about: The hardware in the phone allows you to take much more current than the basic specification says. Understanding the power controller's real-world capabilities will help you choose the right accessory to work more efficiently. Let's go into detail about the specifications and the speed of this process.
Technical characteristics of the full-time power adapter
The standard power supply, which comes with the Redmi Note 8 Pro, is labeled as the MDY-10-EH. It is a classic solution from Xiaomi, made in white. Its power output is 18 watts, which is implemented through various combinations of voltage and current. In Quick Charge 3.0 mode, the device is able to dynamically change the parameters of the power supply.
A key feature is Qualcomm’s Quick Charge 3.0 support.This standard allows the power supply to “negotiate” with the smartphone, choosing the optimal voltage from the range of 3.6 to 20 volts in increments of 200 mV. This provides more accurate and faster charging compared to fixed standards.
💡
Use the original cable from the kit, as third-party cables may not support the required currents and limit charging speeds to 10W or even 5W.
Importantly, the cable in the kit also matters: It must be able to pass a current of at least 2 Amps without significant losses. If you use a damaged or too long after-production cable, the actual power reaching the battery can be well below the passport 18W.
Supported fast charging protocols
Although the box contains an 18W block, the Xiaomi Redmi Note 8 Pro itself features a more advanced charge controller.The MediaTek Helio G90T hardware platform on which the device is based supports MediaTek Pump Express technology. This opens up opportunities for more powerful adapters.
The device officially supports the input power up to 27 Watt (9V/3This means that if you connect a power supply to the phone with Pump Express protocol support 3.0 or compatible standards PD (Power Delivery) with the appropriate profile, the rate of energy recovery will increase significantly. 20-25% compared to the staff unit.
💡
The maximum supported power of the Redmi Note 8 Pro is 27 watts, which is higher than the standard 18 watts.
The list of supported protocols is as follows:
- ⚡ Quick Charge 3.0 (Basic Standard)
- ⚡ MediaTek Pump Express 3.0 (for accelerated charging)
- ⚡ Standard regimen USB BC 1.2 (5V/2And)
It should be borne in mind that when using third-party power supplies of high power (for example, 65 watts from a laptop), the phone will take exactly as much as its controller allows. Overload will not occur, but charging faster than 27 watts will not go.
Speed comparison: 18 W vs. 27 W
Many users are wondering whether to buy a new 27W power supply if the kit comes with 18W. The time difference is really palpable, especially if you are used to charging your phone in short sessions during the day. When using a regular 18W adapter, a full 4500mAh battery charge cycle takes about 1 hour and 45 minutes.
When switching to a 27W certified adapter, the full cycle time is reduced to 1 hour 20-25 minutes. The greatest speed gain is observed in the charge range from 0% to 50%. In this phase, the difference can be up to 15-20 minutes in favor of a more powerful unit.
Below is a table showing the approximate charging times of the various adapters:
| Adapter type | Power | Time 0-50% | Time 0-100% |
|---|---|---|---|
| Staff (QC 3.0) | 18 W. | ~55 minutes | ~105 min |
| Accelerated (Pump Express) | 27 Watts | ~35 minutes | ~80 minutes |
| A regular USB. | 10 Watts. | ~85 minutes | ~160 minutes |
As can be seen from the data, the performance gains from using a 27-watt unit are significant for this generation device.
How to check the real charging power
To make sure your smartphone is charging at the highest possible speed, you can use software diagnostics. There is no built-in watt counter on the lock screen in the MIUI system, unlike some other shells, so you will need to install third-party software.
One of the most reliable tools is the AccuBattery or Ampere application. Once installed and given the necessary permissions, these utilities show the current consumption current in milliamperes (mA). To translate into Watts, you need to multiply the current by voltage (usually about 9V for fast charging).
Why is the testimony jumping?
Also worth noting is the indicator in the status bar. When you connect a quality fast charger, you can see the words "Fast Charge" or "Quick Charge" on the screen. If you just show "Charge", then the handshake protocol has not passed, and the charge is slow.
Effect of temperature on charge speed
The power controller in the Redmi Note 8 Pro is closely related to thermoregulation. The Helio G90T processor is known for its heat generation, and when you use your smartphone actively while charging, the body temperature can rise rapidly. The protection system automatically reduces the current to prevent the battery from overheating.
⚠️ Warning: If you play heavy games while connecting to the network, the charging speed may drop to a minimum or the charging will stop altogether before the device cools down.
The optimal temperature for fast charging is considered to be a range of 15 to 30 degrees Celsius. In hot weather or in direct sunlight, the efficiency of the Quick Charge and Pump Express algorithms decreases. It is recommended to remove the case, if it does not remove heat well, during intensive charging.
Recommendations for the choice of an additional power supply
If you’re considering buying a more powerful adapter to speed up the process, it’s important to pay attention not only to watts but also to protocol support. GaN-labeled power units are often smaller and more efficient, but you need to make sure they support Xiaomi and MediaTek protocols.
☑️ Criteria for the choice of charger
Xiaomi’s original 27W or 30W units (MDY-11-EH models or equivalents) are a good choice, guaranteed to be compatible and deliver the speed claimed, and high-quality multi-protocol-enabled brands like Anker, Baseus or Ugreen are also suitable.
⚠️ Warning: Avoid cheap Chinese power supplies without a name or with a suspiciously low price tag.They may not stabilize the voltage, which will cause wear and tear on the power controller in the smartphone.
When buying, pay attention to the output connector. Fast charging requires a USB Type-A (blue inside) or Type-C port with appropriate support. Old black ports (USB 2.0) will not physically miss the required current.
Extension of battery life
Using fast charging, whether 18W or 27W, inevitably results in more intense chemical wear on a lithium-polymer battery compared to a slow 1A charge. However, modern Xiaomi controllers are able to minimize this harm by adjusting the charge curve.
To keep your Redmi Note 8 Pro battery lasting longer, try not to keep your phone permanently connected to the network after reaching 100%, it is also not recommended to regularly discharge the device to 0%, the optimal range for battery chemistry longevity is from 20% to 80%.
💡
Turn on the MIUI Night Charging Optimization feature if available in your version of the software, which suspends charging at 80% and reaches 100% before you wake up.
If you’re not in a hurry, using a less powerful power supply (like 10-12 watts) at night will be a more gentle mode for the battery than using a powerful 27-watt adapter that creates more heat.