Fast Charging Technology Explained: 0-100% in a flash

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What is fast charging in mobile phones? As the name implies, it is any type of high-speed battery-charging system implemented in a mobile phone to reduce the time it takes to fill up the battery. With regular charging, sometimes it takes a whole of three hours to charge up a phone fully. High-speed charging solutions cut that time down dramatically.

There are different solutions in the market, with each manufacturer often developing their own proprietary system and going by a unique brand name. But whatever the specifics of these solutions, they all work by a broad principle.

How Fast Charging Works

Fast charging in mobile phones works by pumping extra electrical charges into the phone, usually in two phases. The first phase happens between 0 and 80%, approximately, and happens much faster than the second phase.

The second phase is slower for safety reasons, because it is a critical period when the battery already has a lot of charge and is less stable. This means, accidents can happen if charging continues at the initial speed, so designers build the charging solution to slow down here. That is why your phone takes much longer to go from 80% battery to 100% than you’d like. But it is for your safety.

That is also the reason why some phones stop charging at 80% under certain conditions e.g. if the weather is hot. The in-built fail-safe system cuts off charging to keep the phone cool and stable.

Fast charging technology

Different Fast Charging Technologies from different phone makers

OPPO‘s charging solution is called SuperVOOC. Their 150W SuperVOOC solution charges a 4,500mAh battery from 0-50% in just 5 minutes, and 0-100% in just 15 minutes, while their new 240W SuperVOOC solution does 0-100% in a mere 9 minutes.

Infinix’s fast charging solution is called Flash Charge. The company’s 160W charger has demonstrated taking the phone battery from 0% to 100% in 10 minutes.

Xiaomi‘s charging technology is branded HyperCharge. The 120W HyperCharge charger takes about 20 minutes to fill up a battery.

Qualcomm’s fast charging solution is called Quick Charge. The latest iteration, Quick Charge 5.0 tops up compatible devices from 0-100% in 15 minutes.

Samsung‘s solution is one of the least impressive in the industry. Most flagship Samsung smartphones have a mere 25W fast charging. The company has developed a 45W charger can do 0-70% charge in 30 minutes, as seen in the Galaxy S22 Ultra.

Apple‘s solution doesn’t have a brand name, but the one in iPhone 13 Pro Max is a 27W solution that charges it up to 50% in 30 minutes.

USB Power Delivery an industry standard charging protocol designed for both mobiles and laptops. If your phone supports USB-PD, you are not limited to using your phone’s fast charger but can also use compatible 3rd party chargers to top up your battery quickly.

USB Power Delivery 3.0 is capable of delivering up to 100W charge. While your smartphone does not need this much power, laptops and other devices do. Remember, we mentioned earlier that this is an industry-wide quick charging solution for USB devices, whether they are phones, tablets, laptops, etc. USB-PD 3.0 will usually deliver a maximum of about 18W charge to your smartphone.

In addition to their proprietary charging solutions, many phone makers include USB Power Delivery support in their devices.

Are fast charging cables different?

As far as the connecting ports are concerned, they are no different from regular charging cables. But on the inside, the components and design may differ.

Is fast charging bad for battery? Can fast charging damage your battery?

The problem with fast charging is the amount of heat generated, which is bad for the battery. However, speedy charging solutions have fail-safe systems built in to terminate the charging should heat like up. So you have nothing to worry about.

Can fast charging damage iPhone?

Fail-safe systems exist to protect your Apple iPhone when fast charging.

How long should fast charging take?

It depends on which solution you are using. For example, 18W takes over an hour to go from 0-100%. 33W takes less than an hour. 65W takes about 30 minutes. 120W solutions do it in about 15 minutes.

Is fast charging worth it?

Definitely. We live in a fast-paced world and no-one wants to spend two or three hours charging their smartphones. The convenience of being able to top up your cell phone battery in a few minutes is definitely worth it.

Which iPhones support fast charging?

All models from iPhone 8 support 15W fast charging and above.

Why does fast charging heat up phone?

Speeding up charging in a phone works by pushing in more electrical charges than usual to shorten the charging time, applying extra stress on the battery, and so causing discharge of heat.

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By Mister Mobility

I have been tech blogging since 2003, I have owned and reviewed hundreds of smartphones since my first in 2001.

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