Not sure but power difference is probably down to different on board stuff.
For power consumption take total watts divide buy 12 will give you amps, divide Ah of battery by amps and that will tell you how long it will run for. Take a bit off as you don't want to discharge the battery too much.
Power wise the usb will be better but as their video performance is rubbish and this is for security then use the proper cctv boards.



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