Best Buy: Digipower Multipurpose Battery Charger for GoPro Hero4 Black/ Silver & GoPro Hero3+ & Hero Battery Charger Black RF-100GP34
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Amazon.com: Batmax 3 Packs 1680mAh AHDBT-401 Battery + LED Dual USB Charger with Type C Port for GoPro Hero 4 Black/Silver Action Cameras : Electronics