It uses the NP-FW50 battery, which is notorious for short life. Plan to carry at least 2–3 spares for a full day of shooting .
When buying used, ask for the "actuations" to see how much the camera has been used; a count under 30,000 is generally considered very good for this model. buy a6500
You get 4K recording at 24/30 fps and high-speed 1080p at 120 fps for slow-motion . It also includes S-Log profiles for advanced color grading . It uses the NP-FW50 battery, which is notorious