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You need to purchase a back for the Droid Charge in order to use the Energizer Inductive Charger.
The inductive cover is modeled to exactly match the existing back cover and is just slightly thicker. As you can see on my Droid Charge the cover fits well and has an opening for the camera and speaker.
The inside part of the cover is where things vary as you can see here. There is a charging/connection system on the replacement back.