[Richwood]

Normally any device that is USB rechargeable is going to current limit input power to a safe level. Just like appliances plugged into an AC outlet. Such outlets are typically limited to 15 or 20 amps output but the devices plugged in will limit themselves to a safe input current based on their current or power rating.

Also why high current wall USB chargers are almost universal. I have ones rated up to 3 amps output which work perfectly for charging older Kindles which are limited to 0.5 amps input.