Is there a way to charge my iPhone while it is turned off?
You may have tried to charge your iPhone while it was powered off only to have it turn itself on as soon as you plug it in to the USB cable or place it on the dock. As a result, it may have seemed that the iPhone insists on being turned on in order to charge.
As it turns out, this is not the case. Simply plug your iPhone in to charge while turned on (or off for that matter) and once it begins charging, power it down. If you power down after charging begins, the iPhone will remain turned off while still charging.