I got these from Amazon.com, seem ok so far
ENEGON Upgraded 15.2V 4500mAh Intelligent Flight LiPo Replacement Battery + Battery Safe Bag for DJI Phantom 3 SE, Professional, Phantom 3 Advanced, Phantom 3 Standard, 4K Drones
by PEZAX-EU
Learn more: ENEGON Upgraded 15.2V 4500mAh Intelligent Flight...