Quick Chargers and Quick Charge versions: All Your Questions Answered

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If you have ever wondered how quick chargers work, this article explains that, including the different available Quick Charge versions and compatibility issues.

Not all chargers are the same. Regular USB 2.0 ports on a PC put out 500 mA (that is half of 1A). Regular USB chargers put out 5 volts at 1A. That explains why charging your phone via your laptop is always a slower experience than using a wall charger. To speed up smartphone charging, various fast charge technologies and chargers have been developed. In this article, we explore how Fast Battery Charging and quick chargers work.

Quick Chargers To The Rescue

Different smartphone and accessories manufacturers have come up with their own branded fast charging solutions. Mediatek calls theirs Pump Express, while Qualcomm calls theirs Quick Charge. Feel free to ignore the branding used by each manufacturer; the principles they work on are similar. They pass more current to the phone to speed up charging.

In order to keep the battery from being overloaded, fast chargers pass more current for a period, so the phone charges faster for that period, and then revert to regular current for the rest of the charging cycle.

But there are different versions of the technology, with each offering shorter charging times than the previous version.

Quick Charge Versions

Let us have a look at the different available versions of Qualcomm’s quick charging technology (we keep updating this list with new versions as they are announced):

  1. Quick Charge 1.0 Charges your phone battery from 0 to 30% in 30 minutes, after which charging slows down. Puts out 10W (5 volts at 2 amp).
  2. Quick Charge 2.0 Charges your phone battery from 0 to 60% in 30 minutes and then slows down. Puts out 9 volts at 1.67 amp (9V/1.67A).
  3. Quick Charge 3.0 Charges a phone from 0 to 80% in 30 minutes, and then slows down. Delivers 18W of power.
  4. Quick Charge 4.0 Charges your phone from 0 to 50% in 15 minutes, and then slows down. It also charges up to 5° C cooler.

quick chargers - quick charge

Pay Attention To Charger Rating

The point to note is that quick chargers are rated differently to enable different rates of charging. As such, it is important what kind of charger you use with your smartphone. Phones have different charging standards too.

For example, to get Quick Charge 2 charging speeds, both your phone and the charger must be Quick Charge 2.0 compatible. Same goes for all other standards. To get the appropriate fast charge speed, you need to use a compatible charger with your phone.

Is A Higher Rated Charger Dangerous For My Device?

If you use a higher rated charger with your smartphone, are you at any risk? Well, your phone will heat up a bit during charging, because more current is being passed into it. But modern phones have regulators built in and there is no risk of your phone being damaged by a higher rated charger. The built-in regulator will let in only the recommended amount of current.

Using a more powerful charger will speed up the charging process, depending on the charging standard your phone is compatible with. At worst, it will charge your phone like any ordinary charger would.

In summary, whichever charger you use, the smartphone decides how much current is drawn.

The Summary

The summary of the whole matter is that if possible, get the most powerful charger that you can get your hands on. Whatever the charging standard your smartphone supports, you know you are covered. When you change phones, you can also relax knowing that it does not matter what type of charger is bundled with it. You have a quick charger that has you covered.


There is a range of quick chargers available in the market. My default go-to quick charger is a Nokia 5V / 2A charger, but the most capable that I have used is Infinix’s CQ-18YX rated 5V-9V / 2A and 9V-12V / 1.5A. The CQ-18YX is bundled with the Infinix Note 3 and Infinix Zero 4 Plus.

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5 comments

  1. I just checked the specs of the M2 and can’t find a reference to fast charging. Do confirm this. If the phone doesn’t support any fast charging technology, the Inifinix charger will only charge it at normal speeds.

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