Thephone takes in as much power as its charging circuit is designed for. Fast charging simply multiplies this to increase and maximise the Wattage, or electrical output. Fast charging, then, is what happens when the amount of current to your phone is increased without the side-effects of over-current.
Bybending the two middle pins, this will trick your Samsung phone into believing that you're using an official charger, thus, kicking into fast-charge mode, which happens at about 800
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