adding a 2nd battery

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=70143
Printed Date: May 15, 2025 at 2:43 PM

Topic: adding a 2nd battery

Posted By: downstarinc
Subject: adding a 2nd battery
Date Posted: January 05, 2006 at 8:03 PM

ok i have a 140amp alternator, a yellow top optima, and about 2300watts sucking it all dry..ive heard that if u add a 2nd battery, they need to be the same exact and within 6 months of eachother..wich is all cool..but i picked up a red top for real cheap and i wanna add it to my system..what would be the result if i did this? good? bad? any way to make it work? any help is appreciated..oh ya im runnin 2 jl 1000/1's , 4 w6v2 12's, and 2 more amps for components/speakers..

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jl audio..nuff said

Replies:

Posted By: KarTuneMan
Date Posted: January 05, 2006 at 11:10 PM

If you NEED 2 use the red top.....put it under the hood.

If you have the yellow top under the hood....your goin backwards, it's a slow discharge battery.... (deep cycle)

Put the red top under the hood.....isolate the yellow top...and hope for the best?

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Posted By: downstarinc
Date Posted: January 06, 2006 at 10:52 PM

hope for the best? i guess what im wondering, what could be some effects of running 2 different batteries?

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jl audio..nuff said

Posted By: downstarinc
Date Posted: January 08, 2006 at 2:46 AM

?????

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jl audio..nuff said

Posted By: ragoal12
Date Posted: January 08, 2006 at 11:10 PM

downstarinc wrote:

hope for the best? i guess what im wondering, what could be some effects of running 2 different batteries?

if not isolated one battery will most likely discharge the other as both batteries will not charge the same... so one will always pull more current then the other.. so it would lead to early failure of one or both batteries.. but when isolated you wouldn't have any problems

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S.O.B custsoms.. South Omaha, Nebraska

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