Brunton Bacpac Power Supply for GoPro Hero3+
I paid 49.99 a few months ago.
Pros: record for longer & can use as powerbank to charge your phone.
Cons: abit of weight added on to your gopro.
any other questions let me know
plenty of stock at officeworks watergardens 3037 VIC
Features
The Brunton Bacpac Power Supply for GoPro Hero3+ allows you to carry extra power wherever you go so you don't have to worry about missing that important shot or video moment.
It has an ultra durable construction to suit your GoPro Hero 3+ original case.
The Bacpac provides up to 12 hours battery life to your GoPro Hero 3+.
It snaps onto the back of your GoPro Hero 3+ so you can shoot for longer.
You can also connect your smartphone to charge it using the Bacpac Power Supply.
The Bacpac comes with a 3 in 1 cable so you'll be able to charge the device itself.
Thanks OP!
Edit: There is a few around eBay for similar price too