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GyroVu USB to Panasonic DMW-BLF19 Dummy Battery Cable GV-USB-GH4
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Camera West
Amazon.com : Wasabi Power Battery for Panasonic DMW-BLF19 and Panasonic Lumix DMC-GH3, DMC-GH4, DC-GH5, DC-GH5S, DC-G9 : Digital Camera Batteries : Electronics