Hi all
Sorry for the simple question.

I need to change the battery on my 06 Hawkeye, wondering about these battery memory keeper things that save having to put in all radio does etc.

Can I use a 9v battery and make my own, I don't have a cigarette lighter in the car, or can I connect a jumper pack 12v to the battery before removal or will this overload the electrics...?

Thanks
G