add a battery or isolate
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=96101
Printed Date: July 20, 2025 at 3:21 AM
Topic: add a battery or isolate
Posted By: Aschaffer
Subject: add a battery or isolate
Date Posted: August 01, 2007 at 4:03 PM
Im just wanting to see peoples opinions on just adding a second battery to my car, or adding a battery isolator and then add the second battery? I have a kicker 1250x1watt amp, and a kicker 900x4 watt amp. I have a 35 farad stinger hybrid cap, and a regular battery under my hood, and I want to add a second in the trunk. Thanks!
Replies:
Posted By: haemphyst
Date Posted: August 01, 2007 at 4:53 PM
A second battery without upgrading your alternator is throwing good money after bad. The cap is doing you no good, and an additional battery won't do you any good, either, without a charging source...
Once you upgrade your alternator, THEN you can add an identical battery to the rear of your car, (that means AGE, too!) but DON'T USE ANY ISOLATION. Simply wire them in parallel, and be done with the whole thing!
Isolation (and a second battery) will provide you with no benefit for your SYSTEM, all it will allow you to do is sit with the car off, and still be able to start the car, even after the system pulls the secondary battery dead. If you are looking for parking lot time, THEN add the isolation, but if you are adding a second battery for system performance, then leave it out.
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