How to link another car battery to existing battery?

Question

I have a 95 accord currently. I have an Alpine head unit, with infinity speakers all around. I am also running a 200 W rockford fosgate amp for a rockford fosgate 10" stage 2 punch subwoofer. I want to put in (at least) a 500 W amp to run 2 12" subs if not more. Now the battery for that car is not big, as compared to like a SUV or truck. How do you link another battery, in the trunk, to the existing battery? Or can I just get a bigger battery to power that stuff? I would prefer to not get a bigger alternator by the way. Any suggestions please tell me, because I would like to add more stuff as well, like another amp at sometime to power the speakers too, so if a bigger battery and a capacitor maybe for big power spikes works then let me know, thanks!

Answer 1

I got a 94 accord and if thats just 500w total you should be good to go. Just get a decent drycell battery to replace the current battery and do the Big 3 upgrade. My system is pushing 600w with no severe voltage spikes

Answer 2

adding batteries don't do anything, car batteries are just rechargeable 12 volts.. your alternators recharges your battery...the problem is the alternators can't recharge your battery when u have to many electronics so adding another battery just slows the process in half but eventualy your car will die so just get a higher out put alternator ok!!! unless there is a reason u don't want to?????

Answer 3

a second battery for only 700 watts of power?

why don't you just try a capacitor?

or try upgrading the "big 3"

bigger gauge ground wire grounding your battery to your car, bigger wire from the alternator, and a bigger power wire going to your amp/s

besides if you had 2 batteries you would need a new alternator every 4 or 5 months unless you got one pushing more amps... so maybe just getting the new alternator would be the best thing for you (even though you don't want to)