I want to fit an auxiliary (leisure) battery in the boot of my vehicle. It would be easier and less intrusive if I could get it in the engine bay but alas that would be too much to ask so , boot it is. Anyone fitted one in any estate. Not just my car. I'd like some tips or advice as this is the biggest electrical project i've attempted on a car. I'm using a fridge/cooler for fishing trips and as I fish on my own in some pretty remote places I need to know my car will start and keep my bait (and my food) nice and fresh.