Charging requirements for the GPSMAP 66i

The unit has no specific charging requirements. It will charge from any USB source with meets the original USB minimum of 500mA. It will charge faster with sources which deliver higher current. 

There have been reports of difficulty charging iR devices from power banks. I have never had any difficulty myself. The issue appears to be that the power bank my shut down when the device nears full charge and decreases its current draw.

DAF7 Hello please see the following link for more details GPSMAP 66i Battery and Charging Specifications

Thanks Leslie!