Adding a 2nd battery in the trunk in parallel, as a backup

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Mar 25, 2014 | 03:40 PM

#11

zeroptzero

Joined: Oct 2009

Posts: 29,896

Likes: 5,435

From: Ontario Canada

Quote:

Originally Posted by 6262

Quote:

Originally Posted by starchland' timestamp='1395746900' post='23079894

You could but it is reccomended to use the same battery in the trunk as you are using up front. You could use different batteries but that would complicate the situation. What I would do is keep the current battery in the car on trickle charge.

for traditional batteries i would do this, but for lithium poly batteries you will wreck the battery with normal trickle charging. and it only has about a few days before the parasite draw weakens the battery.

Lithium batteries don't like constant low power draws. If you have a higher parasitic draw I'd probably stick with an AGM lead battery despite the weight difference, or try to get your parasitic draw lowered. I think the average S2000 has a draw of approx. 7-10 milliamps. Have you ever measured yours ?.

Mar 25, 2014 | 04:02 PM

#12

afzan

Joined: Mar 2010

Posts: 3,601

Likes: 103

From: Toronto

I believe AGM batteries have lower reserve capacities than traditional batteries.

That's the conclusion I reached when I was looking at batteries earlier. My alarm is power hungry so I'm going to get a new tradional style battery in spring

Mar 31, 2014 | 08:59 AM

#13

deanob

Joined: Feb 2009

Posts: 538

Likes: 3

Quote:

Originally Posted by 6262

Quote:

Originally Posted by deanob' timestamp='1395758047' post='23080144

I would just get a optima redtop and call it day... It will be able to handle any type of slow discharge and still have the cranking power to turn over everytime.

i hear you, but it weighs about 5-7x a lithium battery and wont fit in the oem location.

I guess they don't make red tops that size, here's the part no. for the a yellow.
8071-167 D51 YELLOWTOP

Lithium Ion is cool, I just dont see it being practical.