Core SWX Battery Eliminator USB with Backdoor DV-GP4-USBC B&H
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Core SWX Battery Eliminator USB for GoPro HERO4 (10 ft)
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Amazon.com : Smatree 1290mAh Replacement Battery Compatible for GoPro Hero4 (Pack of 2) Bundle with 3-Channel Charger and USB Cord : Electronics
SANDMARC Procharge - Triple Charger for GoPro Hero 4, 3+ and Remote