Our friend Udi Tirosh from DIYPhotography thought that could be a good idea to share with us his battery setup for his Sony Camera.
He is using a Tether Tools case relay ($99) and an Anker 20,000 mAh battery ($35).This gives him about X12 more time than the default Sony poor battery for less money.
The original sony battery is quite feeble, it carries only 7.3Wh of energy. One issue, is that 7.3Wh is not a lot of energy for video (and definitely small capacity for 4k). The other issue is that this gives you about 5.9Wh per dollar. It’s not horrible, but definitely not optimal. -said Udi-