If you had to run the Blackmagic Design ATEM Mini Pro using only battery power, could you do it? 
I have the ATEM Mini Pro on a Smallrig rack with accessories to attach a display, a Samsung T5 SSD drive, and a plate that I mounted a battery power attachment. Using one Kastar brand Sony-style NP-F980 battery will power the ATEM Mini Pro, the Lilliput monitor, and record to SSD drive – but only for about thirty minutes or so. By using the battery with just the ATEM Mini Pro, it would power just that devie for almost an hour. I will start experimenting with adding a couple of additional batteries to this setup. The Lilliput 7 inch display has a battery receptacle for Kastar battery. It should power the display for several hours. I also alternately use the Blackmagic Design Video Assist 7 inch monitor/recorder, and it has battery receptacles for two Kastar batteries.
I am using the Kastar Magic NP-F980Exp Battery: It can be charged with Micro USB with 5Volt 2A adapter. It has 5Volt 2.1A Output and can be used as a Power Bank. Also you can see the battery status any time with 4 LED lights on the battery. I was able to place Kastar Magic Batteries in parallel, with the USB cable from one sending power to the other. I also tried two Kastar batteries in a modified V Lock battery rig, which worked well. The batteries are not hot-swappable though.
Battery Type: Lithium-Ion;
Battery Voltage: 7.2V;
Battery High Capacity: 8700mAh.
Safe to Use: Kastar lithium-ion battery cells meets UL1642 & CE safety standards to ensure that your battery pack will be safe to use as a replacement for your unit. Comes with built-in over-charge, over-discharge, over-voltage, over-current, and over-heating protection circuit.
For most people, I would recommend using a larger rechargeable power source with inverter. Something like a RAVPOWER battery/inverter unit would last longer and be more reliable than this Kastar battery setup. This RAVPOWER power source will give you about three hours time with all your streaming gear plugged in.
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