What is fast charging?
Well, it’s a great question. Fast charging is an annoyingly vague term used to describe a quicker charging rate than the standard rate the phone will charge at.
In other words, there is no single standard – or charger – you can buy that will make your phone fast charge. It depends upon the phone, the charger and even the cable. And some phones can charge faster than others.
For Android phones, many support Qualcomm’s QuickCharge but there are various standards within that, so you’ll need to check your phone’s documentation or specifications to find out which standard it supports, if any.
Some manufacturers have their own standards, such as Huawei with its SuperCharge. Motorola calls its system Turbo Charge and Samsung has Adaptive Fast Charging.
The fastest we’re aware of it Huawei’s 55W SuperCharge for the Mate X. The Mate 20 Pro can charge at 40W, and iPhones (iPhone 8 or newer) can charge at 29W if you use Apple’s USB-C charger and an Apple USB-C to Lightning cable.
Does my phone come with a fast charger?
If you’re unsure, you’ll need to know two things: the wattage of your charger and the maximum wattage your phone can charge at.
For the first, it’s as simple as looking at the charger itself. This may have the wattage printed on it (as with Apple chargers) but it might have output(s) quoted as volts and amps.
for example, if it says the output is 5V at 3A, then it’s a 15W charger because Watts = Volts * Amps. If your charger quotes a mA figure, then divide it by 1000 to get the value in Amps. Like the USB-C PD charger above, you might see a variety of outputs, so using that formula will allow you to calculate which one provides the most watts (it's 27W, as marked at the top left of this particular charger).
Finding out the maximum wattage your phone can accept is trickier. You may have to turn to Google to search for your specific model and its detailed specifications. If the charger’s output in watts matches the maximum wattage the phone will take, you have the fastest possible charger for it.
But if you find out that your charger doesn't offer enough power, here are some recommendations of the best USB Charger and Cable to buy.
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