Reading that other post about an extra battery reminded me of this problem I need to solve.

I sometimes run my system for hours on ends without the car on (don't ask me why ) and one time my car almost didn't start :thumbup:

I was wondering what I could do to let it run without draining my battery down to the point where my car won't start. I have a huge nearly brand new exide battery sitting at home so maybe hook that up somehow? (I don't know what I would need).

Gimme some opinions