Hello!
A bit late to the party, but maybe someone else finds this useful.
For the Aputure 600d to run on full power you need 720W, probably 600 for the light and 120 for the control box.
This means that you need a total of 720Wh worth of batteries to run it for 1h.
The light has 2 battery slots. Which means we can divide the 720Wh by 2. Which gives 360Wh.
To my knowledge there are not many v-mount batteries with 360 Wh. There are some around 350Wh.
This means that you can probably never expect the lights to run for 1h on 100% with just 2 batteries.
The battery also needs to be able to deliver 360W continously. That means Power = Voltage x Current.
You need a combination of voltage and current that equals 360W during the whole time. And also keep in mind that the battery voltage drops from full charge to empty.
With just 2 V-mounts, I dont think you should expect more than 30-35 mins on 100%. on 50% double the time, but then you are better of with a Aputure 300d which control box only draws 50W, so you would get more light output with the same power as the 600d on 50%.
