With OEMs opting to make their flagship smartphones thinner each year, we're starting to see more companies employ fast charging technology as a way to compensate for smaller battery capacities. There are plenty of competing fast charging technologies out there such as OnePlus's Dash Charge, Qualcomm Quick Charge, and the USB Power Delivery standard. Huawei has also been working on their own proprietary fast charging technology and is calling it Huawei SuperCharge.
Huawei filed for a trademark on the SuperCharge name last year and has only used it in a limited number of their devices (the Huawei Mate 9 being one of them). We generally see OEMs advertising 4-6 hours of use on a 10 or 15-minute charge, but Huawei goes beyond that. They are advertising a full day's use from a 20-minute charge on their website right now. Naturally, this comes with some caveats and the company is pulling this data from their lab tests under very specific conditions.
The batteries in our smartphones are considered volatile because of the materials used inside them. On occasion, this has resulted in batteries expanding, smoking, catching fire, and causing an entire recall due to faulty units. This risk can be increased when fast charging technology is used due to the methods involved in recharging the battery much more quickly. The companies employ many techniques to ensure that safety concerns are taken into consideration, but there is still a tiny amount of risk involved here.
To combat this, Huawei has now partnered with TÜV Rheinland so they can certify the Huawei SuperCharge technology. TÜV Rheinland has been around since the 1800s and they have been inspecting and certifying all sort of products for safety concerns. Huawei SuperCharge uses two extra pins in the USB-C port to deliver 5A at 4.5V. This helps to increase the charging speed while also keeping the temperatures lower than normal (thanks to the low voltage). So Huawei is hoping this effort focused on safety will assure their customers that they are in good hands.
Source: GSMArena 
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