Bionic Extended Battery Question

I believe that you need an entirely new battery door for contact charging

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the phone requires a whole new back cover and that cover only fits stock battery. you allso need a charging mat.Wireless Charging Battery Cover for DROID Bionic - Overview - Motorola Mobility, Inc. USA
I hate to speculate, but am I correct in understanding that the standard battery / door is compatible with contact chargers while the extended battery is not? (Meaning the extended battery may only be charged with the microUSB connection.)

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