Fast charging has become one of the most valued features by smartphone users. Being able to recharge the phone in a few minutes makes a big difference in daily use, but not all fast charging systems are the same. There are different standards, protocols, and technologies, and knowing them is key to understanding which chargers and cables to use, how to make the most of them, and what the possible risks are.
What is fast charging?
Basically, fast charging involves increasing the power (watts) sent to the device's battery. The formula is simple: Power = Voltage x Amperage. While a standard charger offers 5V and 2A (10W), fast chargers can reach 20V and 5A (up to 100W or more). However, for this to work, both the charger and the device must be compatible with the same fast charging protocol.
Most common standards and protocols
USB Power Delivery (USB-PD): It is the most widespread open protocol, compatible with a wide variety of devices, from mobiles to laptops. Its versatility and safety have made it the standard of choice for many brands, including Apple, Google, and Samsung.
Qualcomm Quick Charge: Developed by Qualcomm, it is common in mobiles with Snapdragon processors. Quick Charge 3.0 can reach 36W, while Quick Charge 4 and 5 are compatible with USB-PD and offer much higher power.
MediaTek Pump Express: Similar to Quick Charge, it is present in devices with MediaTek processors. The latest versions also adopt compatibility with USB-PD.
VOOC / SuperVOOC / Warp Charge / Dash Charge: These are proprietary technologies from OPPO and its associated brands (OnePlus, Realme). They use low voltage and high current to achieve very high power (up to 240W in some models), but require specific chargers and cables.
Xiaomi HyperCharge, Huawei SuperCharge, and Motorola TurboPower: Other proprietary solutions that, while achieving ultra-fast charging (100W and above), are usually exclusive to each brand and not compatible with each other.
Why doesn't fast charging always work?
One of the most common questions among users is why their phone is not charging fast, despite using a powerful charger. The answer usually lies in the protocol: if the charger is not compatible with the phone's charging system, it will reduce the charging speed for safety. Additionally, the cable must also be suitable. A cable that does not support high current will limit the transmitted power, even if the charger is capable.
Does fast charging damage the battery?
Not necessarily. Modern systems are designed to control temperature and avoid overheating. Even so, the heat generated can, over time, affect the battery's health. Therefore, it is recommended to use fast charging only when necessary and not leave the phone charging overnight if it is activated.
Tips to make the most of it
- Make sure to use a charger and cable compatible with your device.
- Check the manufacturer's specifications for supported protocols.
- Avoid using generic chargers that do not specify their power and compatibility.
- Use apps like Ampere or AccuBattery to check the charging speed.
Frequently asked questions
Can fast charging work without the original charger?
Yes, as long as the charger and cable support the same protocol (USB-PD, QC, VOOC…), it does not need to be the manufacturer's original.
Why doesn't it show as "fast" charging if I use a powerful charger?
Most likely, they do not negotiate the correct protocol. Fast charging only activates if there is a way to communicate through the compatible protocol.
What is the difference between “Fast”, “Flash” and “Quick”?
- Fast Charge: usually refers to traditional voltage fast charging (PD or QC).
- Flash Charge: generally high current (like VOOC), a commercial term for higher amperage.
- Quick Charge: Qualcomm brand, automatically increases voltage through INOV.
What is the fastest charging currently available?
Standards like Realme 240W, iQOO 200W, ZTE 165W, Xiaomi 120W, Motorola 125W, Samsung 45W, PD chargers of 100W+.
