yeah people do that shit all the time
but you HAVE to have a good altenator.
think about it. you have one battery that is running your car and your system. your altenator powers that.
then you put two batteries in your car. one for your car, one for your system, and both running off the same altenator. your altenator will eat shit quick.
get a new altenator and you won't have to worry about another dedicated battery.
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