What is adaptive fast charging?

Adaptive fast charging is a relative innovation in the technological world, and it is already well on its road to long-term success and further innovative research. Considering whether the new cell phone supports fast charging or not is a new trend amongst people.

Previously, it was the RAM, internal memory, screen resolution and processor specifications that impacted one’s decision to buy a specific cell phone or not, but now, battery life and charging time are also important factors that affect the choice of a potential customer in purchasing a phone. The cellphone companies, too, don’t lack in advertising the features of fast charging in their devices.

Adaptive Fast Charging

The answer to “what is adaptive fast charging?” is simply “adaptive fast charging is a technique of charging phones’ batteries in less time with better quality of power, and at the same time it also prolongs the battery’s long-term life by smartly stopping when the phone doesn’t need any more power.”

All or most of the phones these days support some fast charging, known as…


For example, Samsung Galaxy S8 is compatible with Quick charge 2.0 and supports adaptive fast charging (AFC). It charges quite fast at a rate of 9V/2A but when fast charging is turned off, the rate can fall to as low as 5V/2A.

With fast charging turned on, the Samsung Galaxy S8 can be charged to 50% in almost 35 minutes. On the other hand, Apple’s latest flagship phone, iPhone X can be fast charged in around 30 minutes with the possible max power reaching to about 29W (watts) according to Apple (again, if recommended certified equipment is used).

How does adaptive fast charging works?

Most cellphones use a rechargeable lithium-ion (Li-ion) battery which functions in a way that ions supply the electricity to run the phone by flowing the electrons to the battery’s negative outer terminal.

Moreover, when the battery is charged, it absorbs power by chemical reaction of ions moving in. It is essential to keep in mind that different cellphones have batteries of different sizes, measured in mAh (milliampere-hour), for example, 3000 mAh and 6000 mAh. The bigger the capacity of a battery, the more time it takes to charge completely.

With the above-mentioned information, which is compulsory to know for further learning, we can get back to our original question, “how does adaptive fast charging works?”

This technology charges the devices rapidly by increasing the power inflow to the devices. This is safe these days because most of the smartphones, if not all, have chips installed in them that continuously monitor battery temperature and the power being consumed by the phone; if there is a potential danger of explosion or fire, the mobile itself stops consuming power and the fast charging will be turned off.

This is the reason why people find their chargers and their cell phones getting hot while charging. The chargers have a chip installed in them too which identifies how much power is needed by the device at a particular time. If you carefully observe, fast charging functions better when the battery is at low power (it turns off when the battery reaches 80%) this is because when the battery is empty, ions have more space to move and the charger sends in the highest rate of power the battery can survive.

So, fast charging is all about the communication between the chips installed in cell phones and the chargers. This is the primary reason why it is always recommended to use high-quality USB cables to avoid accidents including fire and explosion.

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