Fast Charging Speeds Compared: How Long Does It Take to Charge Your Battery from 0% to 100%?

Fast charging is a feature that allows you to charge your device faster than the standard USB output of 5V/1A or 5W. Fast charging speeds in mobile phones are the rates at which the phones can receive power from a compatible charger and fill up their batteries.

Fast charging technologies vary the voltage and/or the current to deliver more power to the battery, up to 100W or more.

Different devices and brands support different fast charging speeds and standards, and they require compatible cables and adapters to work properly.

How Fast Charging Speeds Are Measured

Fast charging speeds are measured in watts (W), which is the product of voltage (V) and current (A). For example, 10W fast charging means 5V/2A, 15W means 5V/3A, 18W means 9V/2A, and so on.

The higher the fast charging speed, the faster the battery can be charged from 0% to 100%. However, fast charging is most effective when the battery is less than 50% full, and it slows down after 80% to protect the battery.

The advantages of fast charging include saving time, convenience, and better performance. The disadvantages include higher cost, lower compatibility, and potential safety issues.

Fast Charging Speeds compared

Drawbacks of Fast Charging In Phones

Here are some of the main disadvantages of fast charging in phones:

It can generate more heat, which can damage the battery and reduce its lifespan over time.

It can cause overcharging, which can also degrade the battery and make it lose its capacity and performance.

It can increase the cost, lower the compatibility, and raise the potential safety issues of the charger, cable, and adapter.

Therefore, fast charging is not always the best option for your phone. You should use it wisely and avoid charging your phone when it is already full or very hot. You should also use a compatible and reliable charger, cable, and adapter that support your phone’s fast charging standard.

Fast charging in mobile phones

Compare Fast Charging Speeds

To compare the different fast charging speeds, here are some examples of how long it takes to charge a typical 4,000mAh battery from 0% to 100% with each speed, assuming ideal conditions and no slowdowns:

  • 10W: about 2 hours and 24 minutes
  • 15W: about 1 hour and 36 minutes
  • 18W: about 1 hour and 20 minutes
  • 20W: about 1 hour and 12 minutes
  • 25W: about 57 minutes
  • 33W: about 43 minutes
  • 44W: about 32 minutes
  • 67W: about 21 minutes
  • 120W: about 12 minutes
  • 180W: about 8 minutes
  • 240W: about 6 minutes

But, as already mentioned, there is a slowdown in fast charging technology when the battery reaches a certain level of charge. This is because the battery needs to be stabilized and protected from damage or degradation. The slowdown usually occurs after 80% of the battery is full, and the charging speed reverts to a slower rate. This helps to extend the battery life and performance.

As such, the true real life fast charging times will likely be longer than the above-listed times.

The slowdown in fast charging affects battery life by reducing the amount of stress and heat on the battery. This helps to preserve the battery’s capacity and performance over time. However, the slowdown also means that the battery takes longer to reach a full charge, which may be inconvenient for some users.

Therefore, the best way to balance fast charging and battery life is to charge your phone when it is between 20% and 80%, and avoid charging it overnight or when it is already full.

0-50% With Different Fast Charging Speeds in Phones

Some of the known fast charging speeds in mobile phones are:

10W: This is the typical charging rate or power value for most smartphones, which is equivalent to 5V x 2A. A smartphone is understood to support fast charging when it can receive power at any rate higher than this minimum rate supported by USB standards. So, 10W is not considered fast charging.

15W: This is the maximum supported charge speed for phones that use USB-PD (Power Delivery) technology. This means that the phones can charge faster when connected to a USB-C port or adapter that supports USB-PD and can charge up to 50% in about 30 minutes with 15W charger.

18W: This is the maximum supported charge speed for phones that use USB-PD technology. Such phones can charge up to 50% in 30 minutes with an 18W charger.

20W: Smartphones can charge up to 50% in 30 minutes with a 20W charger.

25W: This is the maximum supported charge speed for the Samsung Galaxy S23 Ultra. It can charge up to 50% in 25 minutes with a 25W charger.

33W: This can charge up to 50% in 15 minutes with a 33W charger.

44W: This can charge up to 50% in 10 minutes with a 44W charger.

67W: This can charge up to 50% in 7 minutes with a 67W charger.

120W: This can charge up to 50% in 5 minutes with a 120W charger.

150W: This can charge up to 50% in 4 minutes with a 150W charger.

200W: This can charge up to 50% in 3 minutes with a 200W charger.

240W: This can charge up to 50% in 2 minutes with a 240W charger.

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