As we are moving further, phones more specifically Smartphones are becoming basic need for our daily life, we hardly imagine our life without a smartphone. They are limitless, through them we can do any kind of work on the go, schedule appointments, multimedia, calls, messages that matter for us, being so limitless they have one limit and that is their battery life. The battery is a powerhouse for this small magic box (phone) if battery survives more than we will use this magic box for a longer time.
To overcome this power limitation many companies start to put a huge battery inside a phone say 3500mAh, 4000mAh, 5000mAh or even more. Putting a huge battery would solve this problem but having a huge battery would increase the charging time to fill the battery
So, to overcome this company starts to provide FAST CHARGING technology with these huge amounts of battery capacities.
Some OEM of Fast Charging Technology are:
  • Qualcomm Quick Charge
  • Samsung’s Adaptive Fast Charge
  • OnePlus Dash Charge
  • Motorola’s Turbo Charge
How Does Fast Charging Works:
Fast Charging is nothing but the advanced version of  Standard or Normal Charging.
Firstly, what is the difference between Standard and Fast Charging, so in case of Standard Charging the power adapter provided is of lower power and in case of the Fast Charging adapter possess powerful adapter.
Adapter Ratings:
  • Standard Charging: 5V, 0.8 A to 2A, which conclude to a maximum power of  10W (P = Volt * Current).
  • Fast Charging: 5-12 V, 3A to 1.5A, which conclude to a maximum power of 18 W (P = Volt * Current).
Basically, what a fast charger does is that is provides more current with more voltage to the battery to fill it quickly.
Suppose you have 4000mAh and by standard charger it would take 3-4 hours (approx) to completely charge from 0 to 100% whereas in case of a fast charger it would fill the battery from 0-100% in 2 hrs (approx.).
Here is one animation to illustrate basic functionality of a adapter:
Battery diagram
Suppose if some how the flow or the number of electrons are increased then the bulb will glow more brightly, which is same phenomena as in case of fast charging if electrons are more the battery will charge up quickly.
Fast charging works on a handshake mechanism i.e. before providing huge power it ask phone’s IC that can it handle that much power or not if it replies yes then adapter throw maximum power otherwise act as a standard charge with low power.
So, using a fast charger is safe in any phones but you will only see some differences only in that phones (main boards) that supports fast charging.
Some main boards that supports fast charging are:
  • Qualcomm Snapdragon 625, 626, 835, 845 etc
  • Samsung’s Exynos 9 Series
Using fast charging is beneficial in case of an emergency otherwise use normal charger as it provides battery a better life time as compared to fast charger.