Your choice. You can do both. Ideally you want a fuse in each battery cable. Or a fuse and a switch. Or a fuse and a loop.
Yell for help?
Another thing that needs to be in the manual that nobody (but me) seems to read is that you should always keep a phone on you. Even at home. A few summers ago I went into my garage and closed the door, then had a pilot plus joystick just fail. Stopped moving the chair. It was as hot as hell and I had no means of telling anyone where I was. I had left my phone in the house. Obviously. I thought I was safe in my own home. So I was screwed.
I also have an illiostomy and am paralised so no walking anywhere. So now had 2 problems. And very messy it was too. After 3 hours, a carer turned up. Couldnt figure out where I was, so called my phone. It rang in the same room she was in. So she realised I was not far away. I dont leave home without it. So began looking for me. And found me stuck in the garage... I was imagining being in there for long enough to die with no way out. So was rather pleased she had the sense to look for me. She brought me a spare pilot plus joystick off the shelf. Plug and play. I drove back into the house with that thing in my hand connected up. That was surprisingly hard.
DONT go anywhere without a phone. Even on your own property. You never know.