This GoPro Official Accessory Bundle put together by B&H includes a HERO4 dual battery charger, a HERO4 battery, a battery BacPac, an auto charger, and two tripod mounts.
The dual battery charger charges two HERO4 batteries simultaneously while connected to a USB power source, and it comes with a spare 1160mAh HERO4 battery. The BacPac battery extension adds a 15% boost to your battery life while connected to the back of your HERO. The auto charger features two 1A USB connections to power up while in a car. The tripod mounts can be used individually to mount on a tripod with 1/4"-20 threads, or can be used together as a quick release tripod mount.