Originally Posted by Dr. Drib
Interestingly, Amazon claims otherwise for their e-ink devices:
"Optimized for Kindle tablets: PowerFast is a 9W charger and will charge your Kindle tablets faster than the white 5W Kindle charger will. (Note Kindle e-readers will charge at the same rate regardless of if you use a 5W or 9W charger)"
the device limits the rate to match the battery so no fires