I have a kenyon set with two separate gyros. I always bring a separate cheap small car battery on my magliner (also 220 sine converter, so I can charge phones/nextodi en other stuff)
I use the car battery for powering up the gyros because the power draw is huge at start up and will kill/damage your expensive dichroics etc. Once they're speeded up (5min) they use significantly less power. Then I connect them to the sled power on 1 separate dichroic sololy. For long runs I can connect them to a backpack. Never needed this though.
I use a standard car adapter. In case of dead carbattery, there most of the time is a car around and i can tap of the lighter.