Smatree 1290mAh Replacement Battery (2-Pack), 3-Channel Charger with USB Cord for GoPro Hero 4 Camera Camcorder (Only for GoPro HERO4): Amazon.co.uk: Electronics & Photo
Hero 4 Session Battery - GoPro Hero 4 Session Battery - Spare Module Type GoPro Hero 4 Session Replacement Lithium Ion (Li-Ion) Camera Battery – CutRateBatteries.com
Smatree 1290mAh Replacement Battery (3-Pack), 3-Channel Charger with USB Cord for Gopro Hero 4 Camera (Only for GoPro HERO4): Amazon.co.uk: Electronics & Photo