The 15-watt charger is fast charging, which is the use of measures to increase the voltage and current at the same time to achieve the effect of fast charging, a charging system composed of adapters, cables and terminals, starting from the initial charging state, to charge for 30 minutes, during which the average current entering the battery is greater than or equal to 3A or the total charge is greater than or equal to 60% of the rated capacity of the battery. So 5V3a is a fast charge.
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According to friends in the mobile phone industry, 15w charging is not a super fast charge. Because super fast charge refers to charging technology above 60w, 15w power is still too small to express the definition of super fast charge.
15 watts is slow charge, and now the fast charge standard is to reach 60 watts to 120 watts.