Of course, the 20-watt charger is slow to charge, because the charging power is already low, you want to charge fast directly to get a 60-watt charger or 50-watt charger to charge the phone's electricity on the line, but also depends on how much power your phone's battery can support to output the current, if the power is small, then you can only support so much charging power to charge. Otherwise, even if the charger is large, it will not be able to charge much.