Should Mophie Be on or off When Charging?

Yes it must be turned off during charging. If you charge while left on....you will not have additional power from the Mophie when your phone battery dues. Turn the Mophie off during charging.

How do I know Mophie is charging?

Plug your charger into the phone's USB port. All status lights briefly turn solid, followed by solid light at each charge level and a blinking light at the current charge level. If the battery is fully charged, all lights are solid.

Does the Mophie case have to be on to charge?

Place the juice pack case against the wireless charging base or on the mophie charge force accessory to begin charging. 3. Make sure that the juice pack case is centered on the charging base. (When charging from a mophie charge force accessory the juice pack case will automatically align itself for a proper charge.)