That's pretty much the status quo for EVs now; the batteries are hundreds of volts and you can't easily remove it. Draining it isn't an option either, as it da

That's pretty much the status quo for EVs now; the batteries are hundreds of volts and you can't easily remove it. Draining it isn't an option either, as it damages the battery to be fully discharged. So, you have to work on the car with a live voltage source present. I'm not sure if most modern EVs have manual disconnect switches on the main power cables where they meet the batteries or if you're just expected to wear rubber gloves and use non-conducting wrenches to unbolt the cables. I'd expect any modern EV will at least have contactors to connect the battery to the motor controller (these are basically electrically actuated switches, like a mechanical relay), which will be disabled when the car is off. In general, though, I'd expect the main power cables to be something that doesn't need maintenance and mechanics can generally steer clear of.