The Chinese battery brand Nitecore has announced the world’s first “smart battery” for Sony’s mirrorless cameras. Called the NFZ100, it’s a battery that can be wirelessly managed with an app on your phone. The app is called NNERGY, and it lets you check the current status of your battery in real-time. With a capacity of 2280mAh, the battery allows for about 500 photos on a single charge using a Sony a9. For photographers who have multiple NFZ100 batteries, the app…