battery question

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choover567

Copper - Posts: 51

Joined: June 30, 2005

Location: Washington, United States

Posted: August 21, 2005 at 2:29 AM / IP Logged

would it be a bad idea to run my yellowcap optima battery off of my regular car battery in the front? then off the optima battery ill be running my amp and such? strait pos wire from regular batt to the optima batt... and grounded in different places, good or bad idea?

Chris - 97 Toyota 4Runner

Alpine CDA-9884

Kicker SX1250.1

Kicker 15" L7

Velocity Motors

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Joined: March 08, 2002

Location: Manitoba, Canada

Posted: August 21, 2005 at 10:05 AM / IP Logged

Some say it's not a good idea to run two different batteries for a dual battery set up. If you do, make sure you purcahse a battery isolator otherwise you will run into problems with charging. The ground doesn't matter if it's in two different places, but just ensure you meter the battery in the back for a grounding location that is as close to absolute 0 as possible.

Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

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haemphyst

Platinum - Posts: 5,054

Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: August 21, 2005 at 1:15 PM / IP Logged

It's not a charging issue, but a DIScharging issue. When the car is off, one battery will have a lower internal impedance, and this one will cause the other battery to discharge through it - it will remain fully charged - and the other will slowly collapse. Lead-acid batteries do not like being discharged to deep states, and so one of the batteries will die FAR sooner than the other.

If you are wanting to do this, consider how old the battery in front is, and if it is probably getting ready to be replaced soon anyway. Replace it with an identical battery (another SAME MODEL yellow-top) and you will avoid the need for isolators and what-nots like that.

Everything else Jeff told you... Its right on. Good grounds are essential!

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

choover567

Copper - Posts: 51

Joined: June 30, 2005

Location: Washington, United States

Posted: August 22, 2005 at 12:24 AM / IP Logged

so if i got two optima batteries then... one for my car... ran a pos wire from that battery back to my second optima battery... good grounding... no problem? or still gonna need an "isolator" what is that anyway? sry im a battery newb

Chris - 97 Toyota 4Runner

Alpine CDA-9884

Kicker SX1250.1

Kicker 15" L7

haemphyst

Platinum - Posts: 5,054

Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: August 22, 2005 at 6:01 PM / IP Logged

Yes, you are absolutely correct. Since you won't need an isolator, you won't really need to worry about what they do, but they are simply diodes or relays that allow the alternator to "see" both batteries during charging, but will not allow the batteries to "see" each other. They "isolate" one from the other, allowing one to power your stereo, without the other doing the same. I HIGHLY and COMPLETELY recommend against them, but others highly recommend FOR them...

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

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battery question

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