Yes, under normal circumstances, more than 2a are considered fast charge, because the mobile phone charging voltage is fixed, the greater the current, the greater the power, so the wattage will be larger, the faster the rush. Maximum output 5V3.1A,15.5W, maximum output 5V2A,10W, power is different. Can be used, the actual power is less than 10W, so the first charger 15.5W without heat can be used, and 10W charger may be hot.
This is close to charging, this power is already quite large.