Many hams add power hungry radios to their vehicle power systems. A preferred way to obtain the power is directly from the battery terminals.
I have been adding various gadgets to my Ford Taurus to bring battery power into my passenger area so I can get rid of my cigarette lighter plug for my 2m/440 radio.
Adding a wire to my original battery posts was a problem so I used replacement posts from the car audio market. This turned out to be a mistake.