PMIC limits charging current to 1A . So even if you use 10A charger , battery will charge at 1A. But it charges faster on higher voltages up to 5.5V ( Voltage * current = power . 1A*5V=5W , 1A*5,5V=5,5W). So its ok to use chargers up to 5,5V and 3A - 4A
I think main reason of using weak adaptor...