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post #1 of 27 (permalink) Old 05-05-2019, 12:17 AM Thread Starter
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Battery Recommendation Needed

Need to replace my Optima Red Top battery that was bought new on 6/3/14. Looking for a recommendation from our group for a replacement battery. I searched this site had 112 hits however unable to find any posts on replacement batteries.

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post #2 of 27 (permalink) Old 05-05-2019, 01:51 AM
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Why not replace it with another RedTop? Five years is pretty good, or at least as good as any other battery. If you have an FFmetal battery box, you kinda have to stick with a RedTop as that's what the box was designed for.



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post #3 of 27 (permalink) Old 05-05-2019, 02:41 AM Thread Starter
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Asking to see what other options there are.

I'm unsure if my rear drop battery box is from FF Metal, I didn't build this cobra.
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post #4 of 27 (permalink) Old 05-05-2019, 02:57 AM
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If you have an aluminum battery box that mounts flush with the trunk floor, it's from FFmetal.com, only rear battery box ever made for FFR cars.

Optima RedTop is really the best battery you can buy, especially for these cars.


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post #5 of 27 (permalink) Old 05-05-2019, 05:15 AM
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My red top is about 5 years old, still going strong. If your battery resides in your trunk, you need a sealed battery.

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post #6 of 27 (permalink) Old 05-05-2019, 05:40 AM
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Consider using a Odyssey battery, PC1200 I believe. It is smaller and lighter than the Red Top. When I installed mine, I made a wood base to go into the box where I routed out the center area to fit the battery. A simple mod that kept the battery from moving around in the FF metal battery box. When I bought the battery in 2013, it was about $275, now they can be found cheaper. The Odyssey battery is still going strong for the second owner. I kept it charged using a Battery Tender Jr.

https://www.amazon.com/Odyssey-Batte...01838062&psc=1

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post #7 of 27 (permalink) Old 05-05-2019, 11:16 AM
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PC 1200 Odyssey

I agree with previous post. When I finished my Roadster in 2002 I installed PC1200 Odyssey battery. And replaced it in 2012 with same and still working strong. Also maintained battery with Battery Tender in off seasons. Will use the same PC1200 in Gen 2 Coupe building. Regards Bill
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post #8 of 27 (permalink) Old 05-05-2019, 03:54 PM
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My Red was purchased in 2014 still going strong. Used daily about 10,000 miles.

There are a number of good batteries, chose RedTop because its sealed & there was a custom mounting plate for it that would make removal easy from the trunk.


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post #9 of 27 (permalink) Old 05-05-2019, 04:44 PM Thread Starter
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I removed the Optima battery last evening put it a slow charge overnight, put back in and cobra started right up. It been sitting all winter except for 4 weeks I had it in the shop having some upgrades being done.

Thank you for all your replies.
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post #10 of 27 (permalink) Old 05-05-2019, 07:45 PM
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the miracle battery?

OK, this is where people usually say; "WTF" when I tell them about my Red Top. Especially when I tell them I live in the hot desert, which kills batteries.

It's been in my car for 17 years now . . .

It did [sorta] die once about 8 years ago and I was lucky enough to get educated about Red Top maintenance to make it come back to life.

The local "Battery & Bulb" store that sells Optima batteries told me about "regenerating" the battery, kinda like we all did to old NiCad batteries years ago - load it down (with some tail light bulbs) to just about 7 volts (so the charger doesn't think it is a 6 volt battery) and then trickle charge it to full capacity. That should take about a day. Do that twice. That will regenerate the cells back to almost new.

I do put a Battery Tender Jr. on it if it's going to be idle for more than 3-4 weeks, just to keep it up but have never had an issue with it starting if I forgot to do that.

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post #11 of 27 (permalink) Old 05-05-2019, 08:18 PM
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I changed this battery in the cobra last year.Dont know how or why this happened.But it lasted a Loooong time.I'm thinking its due to the 'inline batt.disconnect switch'


9 years on a $120.00 batt .I'll take it
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post #12 of 27 (permalink) Old 05-09-2019, 12:26 AM
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Just a thought. Buy the Odyssey or Red Top and hope you get 10 years out of it or buy the cheapest battery you can find that will fit and plan on getting 5 years out of it. Get a battery disconnect switch and use it. Get a battery tender for winter storage. Current conventional batteries are designed to be maintained at 100% by an alternator. They usually fail about a year after their first complete discharge. This can be caused by sitting, leaving the lights on, an EFI with a high current draw, etc. I had a Lexus SC430 that would not start after sitting 60 days. Never store a battery on a concrete floor, put a wood block under it. In my Cobra, I got 12 years out of a deep cycle marine battery that I bought at a garage sale.
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post #13 of 27 (permalink) Old 05-09-2019, 02:25 PM
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Since you have a trunk mounted battery, you really should use a AGM type, not lead acid.

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post #14 of 27 (permalink) Old 05-11-2019, 10:46 PM
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post #15 of 27 (permalink) Old 06-03-2019, 02:35 AM Thread Starter
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I thought it was my battery however it was my alternator. It was charging erratic when I tested it at the battery one time it was charging 13.8 volts so I thought it was the battery. Then one Sunday I was going to car show and my turn signal won't flash I looked at my volt gauge it was only charging at about 10 volts. I turn around to go home and it shut off. I have EFI. Had my wife come, she stay with the cobra till I went got another battery to get it home. My Optima red top from Jun 2014 is good.
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post #16 of 27 (permalink) Old 09-11-2019, 09:02 PM
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My old battery died in my under trunk mount, IRS, MKII. I searched this and other forums on which battery to purchase. I ended up with the red top 34 battery. Because of the IRS, the battery was over an inch to tall. Since I was going on weekend trip with the Cobra, I did not have time to order a FF metal box, I instead picked up the Odyssey PC925. Boy, was I surprised when it arrived. This thing is tiny. Sure it fit, but my faith was low. It had no problem starting the car cold or hot. One my way home, we stopped for lunch and left the headlights on for over 2 hours. Again, no issue starting the Cobra. I see why people like the AGM batteries now.
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post #17 of 27 (permalink) Old 09-12-2019, 01:58 PM
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Quote:
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My old battery died in my under trunk mount, IRS, MKII. I searched this and other forums on which battery to purchase. I ended up with the red top 34 battery. Because of the IRS, the battery was over an inch to tall. Since I was going on weekend trip with the Cobra, I did not have time to order a FF metal box, I instead picked up the Odyssey PC925. Boy, was I surprised when it arrived. This thing is tiny. Sure it fit, but my faith was low. It had no problem starting the car cold or hot. One my way home, we stopped for lunch and left the headlights on for over 2 hours. Again, no issue starting the Cobra. I see why people like the AGM batteries now.
I made my own box (IRS) originally in 1999 for a Group 24 Optima and it lasted about 4yrs. Since then I changed to the PC925 and have had NO problems. So, that's going on 16yrs without an issue. You're going to like it. Peace of mind is to put it on a mini charger when not diving for long periods of time. However, batteries are like tires, everyone has a different suggestion.
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post #18 of 27 (permalink) Old 09-12-2019, 04:41 PM
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I made my own box (IRS) originally in 1999 for a Group 24 Optima and it lasted about 4yrs. Since then I changed to the PC925 and have had NO problems. So, that's going on 16yrs without an issue. You're going to like it. Peace of mind is to put it on a mini charger when not diving for long periods of time. However, batteries are like tires, everyone has a different suggestion.
I do not have power in the garage that I store the Cobra in. So I guess I will just have to drive the Cobra year round to keep the battery working.
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post #19 of 27 (permalink) Old 09-12-2019, 05:26 PM
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My battery is from 2012. FFmetal trunk box. I have no idea what brand but I know it was just a regular battery from a local parts store. Stays on the tender most of the time. Still works fine. Low draw, minimal heat in trunk, limited use, battery tender, and luck is probably why it has lasted this long.

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post #20 of 27 (permalink) Old 09-12-2019, 05:49 PM
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I do not have power in the garage that I store the Cobra in. So I guess I will just have to drive the Cobra year round to keep the battery working.
Driving the car is certainly an option.

Solar powered battery tenders are another solution. I have one on my trailer battery, with a magnetic mount on the tongue to hold the panel. The solar panel can be mounted in a thousand different orientations.

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post #21 of 27 (permalink) Old 09-12-2019, 07:23 PM
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Driving the car is certainly an option.

Solar powered battery tenders are another solution. I have one on my trailer battery, with a magnetic mount on the tongue to hold the panel. The solar panel can be mounted in a thousand different orientations.
That is an option also. I just given up 20 used solar panels that were rated at 120W 10 years ago. I would be happy if they ran at 60 Watts. I already have a solar charger controller laying around. One more thing to add to my weekend chore list.
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post #22 of 27 (permalink) Old 09-12-2019, 10:23 PM
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That is an option also. I just given up 20 used solar panels that were rated at 120W 10 years ago. I would be happy if they ran at 60 Watts. I already have a solar charger controller laying around. One more thing to add to my weekend chore list.
You really shouldn't need to keep it charged unless you don't drive it much in Winter. Where we are (according to your ID) we can drive them year round. Nothing like fresh air in the Winter at 70deg.

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post #23 of 27 (permalink) Old 09-13-2019, 02:47 AM
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I used a "PC680" battery on my first car with zero issues on an 11:1 351W. I'll probably use the same one on the new build. I didn't have to worry much about "32 degree" starts, and I suspect most don't:

https://www.summitracing.com/parts/ODY-PC680/


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post #24 of 27 (permalink) Old 09-13-2019, 12:24 PM
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post #25 of 27 (permalink) Old 09-13-2019, 06:04 PM
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To throw another option out there, I went with the Optima Blue top marine starting/deep cycle battery. It has the top threaded terminals, which is what my cables are so no need for adapters and no side terminals to worry about. Also since these cars spend a lot of time stored (just like a boat) it made sense to me to use a battery designed for that environment. 4 years on it so far.

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post #26 of 27 (permalink) Old 09-13-2019, 06:10 PM
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I changed this battery in the cobra last year.Dont know how or why this happened.But it lasted a Loooong time.I'm thinking its due to the 'inline batt.disconnect switch'


9 years on a $120.00 batt .I'll take it
Hello,hello is anyone out there ?
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post #27 of 27 (permalink) Old 09-14-2019, 12:05 AM
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One thing about the battery I posted is that it's very small and can be mounted in more places. If you lay it on it's side it's only 3" tall. There are also a few different mounts available for it.


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