Either, if you own a car or a motorcycle, If you have a medical skill, you can zap people with your car battery like a portable chest paddle. This is MUCH less efficient than any other portable paddles. Maybe a 1 in 10 chance of working. But as a mixer surely you wouldn't have access to top of the range med tech. Much like the clinics, instead of zapping someone with a wall socket, zap them with a car battery!
Even if this isn't included in cars, perhaps just have Kro's sell them as full on car batteries. Which can be used in such a manner. They probably have a chance to electrocute themselves if they aren't skilled in medical. Just an idea!