Quote: Originally Posted by a13n0rma1
Fine for the car and the stereo.
As in, if I were to simply add in a second battery, with a 0 guage cable from + to +, - to -, from the OEM battery to a newer Deep Cycle red top Optima, what would be the harm?
DO NOT DO THIS! Not only will you bugger up the batteries, but theres also a good chance of doing serious damage
Read this. If you want a second battery, do this:
http://www.talkaudio.co.uk/vbb/showthread.php?t=54203