How does fast charging work?
Different standards facilitate different voltage (V), current (A) and wattage (W) values, which paired with the capacity of the battery they’re charging up, dictate the fast charging speeds that are possible
Different charging protocol
In the smartphone ecosystem, many models use in-house technologies rather than the more ubiquitous standards above. However, only a few of these standards are truly proprietary. Many are just Power Delivery or Quick Charge repackaged under a different brand name or featuring some specific tweaks to the technology — Samsung’s Adaptive Charging and Motorola’s Turbo Charging technologies come to mind.
Others like Oppo’s VOOC and Huawei’s SuperCharge operate quite differently. These greatly increase the amount of current for high power charging rather than increasing the voltage. The charging speeds of these proprietary technologies have greatly increased over the years, with SuperCharge, Super VOCC, and OnePlus’ Dash charge being some of the fastest on the market.
For laptops, the situation is a bit different. USB Power Delivery isn't so much fast charging as it is a standard that determines if an adapter or portable power bank is capable of charging a laptop or other high-powered device. With USB-C input/output ports becoming more prevalent, it's now possible for adapters and portable power banks to charge demanding devices that require an output of 18W or more. The Power Delivery spec allows a device to be charged at a maximum current of 5A or 100W.
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