How long to charge the new kindle fire hd with wall plug vs usb?
I don't want to keep it plugged in too long i heard you could damage your device that way.
Don't worry about plugging it in too long. They have circuitry to manage that.
In fact, for devices with Lithium Ion batteries, which most electronics have now, keeping them plugged in is the best way to lengthen the life of the battery.
Don't worry. Its charger is automatic.