Optima Battery - Red or Yellow?
#1
Lubricious
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Optima Battery - Red or Yellow?
Optima users - Any opinions on which Optima battery might be best for the RX-8?
The Red top is maximized for starting power, which might be helpful in getting maximum starting rpm. It's been proposed on the forum that the flooding issue might be helped by having the engine spin faster on startup. I realize the battery isn't going to magically double the starting rpm, but maybe even a little improvement is a good thing.
The Yellow top is optimized for deep discharge. If I run into hard-starting issues and need to repeatedly perform the WOT-start to cure a flood, the battery could be deeply drained at the end of the episode. A deep cycle battery would be better able to handle that punishment.
Also, I won't be driving the car every day. At least once a week though; and more often in winter (I bike to work frequently).
It doesn't get much below freezing here.
Right now I'm thinkin' "Yellow car - Yellow battery", but that's dumb :p
The Red top is maximized for starting power, which might be helpful in getting maximum starting rpm. It's been proposed on the forum that the flooding issue might be helped by having the engine spin faster on startup. I realize the battery isn't going to magically double the starting rpm, but maybe even a little improvement is a good thing.
The Yellow top is optimized for deep discharge. If I run into hard-starting issues and need to repeatedly perform the WOT-start to cure a flood, the battery could be deeply drained at the end of the episode. A deep cycle battery would be better able to handle that punishment.
Also, I won't be driving the car every day. At least once a week though; and more often in winter (I bike to work frequently).
It doesn't get much below freezing here.
Right now I'm thinkin' "Yellow car - Yellow battery", but that's dumb :p
#2
Ricer is Nicer.....
Red.....
Red is probably the way to go, you will never make use of all those 'cold cranking' amps, but it's nice to know they're there....
The yellow top is optimized for deep discharge cycles, which means a more rugged construction, higher price, and LESS cranking amps.
Different strokes.
I remember reading that there isn't a size that will properly fit the '8.....I hope someone can correct me and let us know which is THE one, they are on sale, $30 off, at my local Costco this week....
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doc
The yellow top is optimized for deep discharge cycles, which means a more rugged construction, higher price, and LESS cranking amps.
Different strokes.
I remember reading that there isn't a size that will properly fit the '8.....I hope someone can correct me and let us know which is THE one, they are on sale, $30 off, at my local Costco this week....
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.
.
doc
#3
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Prowl around on here (like I need to tell either of you two about that), but it seems like I saw someone on here just the other day with a red top under the hood. Honestly, I'd like to know as well since I've thought of doing the swap as well to a bigger "electric bleachers" CCA battery.
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Found it, although no mention of the battery size...
https://www.rx8club.com/showthread.p...threadid=18836
https://www.rx8club.com/showthread.p...threadid=18836
#5
I am not sure if I would go with optima. Don’t get me wrong they are the best in the market as for deep discharge and for starting. My concern with the optima is that the Red and Yellow top the terminal are opposite, meaning the positive post is located facing in the in the front of the vehicle (terminal closer to the side) not in the back of the vehicle as the stock battery. You can turn the battery around but by doing that you will have to stretch the positive cable because is farther away. Also with the 60A fuse attached I am not sure if that will fit.
I did some research and Optima has the Orange top. It’s the same specs as the Red but it the terminal orientation is reversed. I think that will fit better.
In my case, I am leaning towards the Exide Orbital batteries. Its pretty similar as the Optimas in performance and size but it has the terminal closer to the edge. They also have a model that has double terminal see picture. I am not sure if the double terminal is discontinued but is worth to check it out in you local auto part store.
I did some research and Optima has the Orange top. It’s the same specs as the Red but it the terminal orientation is reversed. I think that will fit better.
In my case, I am leaning towards the Exide Orbital batteries. Its pretty similar as the Optimas in performance and size but it has the terminal closer to the edge. They also have a model that has double terminal see picture. I am not sure if the double terminal is discontinued but is worth to check it out in you local auto part store.
#6
This top-view drawing illustrates post placement on the Optima Model 34R battery (Orange top).
Note orientation of positive and negative posts.
Model 34R top dimensions are 6.8"W x 10"L. Height is 7.8" including posts.
Case height w/o posts is 6.7". Base measures 6.8"W x 10"L.
Battery has removable comfort-grip carry strap.
Note orientation of positive and negative posts.
Model 34R top dimensions are 6.8"W x 10"L. Height is 7.8" including posts.
Case height w/o posts is 6.7". Base measures 6.8"W x 10"L.
Battery has removable comfort-grip carry strap.
#7
Here is another model with post closer to the edge
This top-view drawing illustrates post placement on the Optima Model 75/35 battery.
Note orientation of positive and negative posts on both top and front (GM Style) of battery.
Model 75/35 top dimensions are 6.8"W x 9.4"L. Height is 7.6" including posts.
Case height w/o posts is 6.6". Base dimensions are 6.7" x 9".
Battery has removable comfort-grip carry strap.
Height adapter is included; it can be used on top or bottom of battery and adds 1.25" height.
This top-view drawing illustrates post placement on the Optima Model 75/35 battery.
Note orientation of positive and negative posts on both top and front (GM Style) of battery.
Model 75/35 top dimensions are 6.8"W x 9.4"L. Height is 7.6" including posts.
Case height w/o posts is 6.6". Base dimensions are 6.7" x 9".
Battery has removable comfort-grip carry strap.
Height adapter is included; it can be used on top or bottom of battery and adds 1.25" height.
#8
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Current (no pun, really) Optima technology makes the red & yellow top virtually interchangeable. The red is optimized (again, no pun) for rapid discharge, thus slightly higher CCAs, while the yellow has a bit better long-term recovery profile. Many of the Jeep ilk now use a yellow as a primary battery, due to their circumstances which place a high priority on battery performance in near-dead mode.
I'm surprised to learn that an orange top (which I presume slots between the two in performance, rather than just hue) is offered, because the differences in the red & yellow are so slight. Maybe they just like filling-out the color spectrum for marketing reasons, and a green top will be next.
{{{{
I'm surprised to learn that an orange top (which I presume slots between the two in performance, rather than just hue) is offered, because the differences in the red & yellow are so slight. Maybe they just like filling-out the color spectrum for marketing reasons, and a green top will be next.
{{{{
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#9
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FYI, Costco sells the Optima Red Top for $99.99. I noticed they had the group 75/35 size available. Sears had them for $129.99. /rx8cited
Last edited by rx8cited; 01-25-2004 at 02:26 PM.
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I thought it was a dry cell at first but evidently instead of flat plates inside the battery it uses a spiral coils of cells in series with each other. Anyone else have better light to shed or a better description?
#13
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The Optima uses conventional lead-acid chemistry, but fully sealed and a novel "plate" configuration (if you can call it that). I looked into the Optima for my boat. I was hoping to see a battery that had a 100+ Ah reserve in either the yellow or blue top to replace my group 29/30s. These batteries don't come close.
I've seen enough posts from people who have cranked their flooded 8's until the battery died trying to get it started. I vote for yellow.
I've seen enough posts from people who have cranked their flooded 8's until the battery died trying to get it started. I vote for yellow.
#14
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Originally posted by S3/P3/E2
I thought it was a dry cell at first but evidently instead of flat plates inside the battery it uses a spiral coils of cells in series with each other. Anyone else have better light to shed or a better description?
I thought it was a dry cell at first but evidently instead of flat plates inside the battery it uses a spiral coils of cells in series with each other. Anyone else have better light to shed or a better description?
The Miata-net article:
http://www.miata.net/garage/battery.html#orig
#15
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I have a yellow top in my rx7 and couldn't be happier. I have let the car sit for weeks at a time with the alarm on and it still starts without a problem. The nice thing about deep cycle batteries is their output doesn't degrade as the charge level is reduced.
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I've got an Optima red top in my C5 and love it! There had been problems with the factory batteries dropping dead for no reason and also battery cases cracking and the acid killing the electronics below. I chose the Optima for performance, strength of the case, and resistance to any leakage.
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This is a common question, and I just posted the following in the RX-7 Forum:
From someone who has lived in "winterville" for 30 years:
Regular lead acid batteries are designed for high current discharge, but meant to be kept at least 60% charged at all times. If you "deep discharge" them, even once, their life will be shortened. Repeated deep discharges will kill them within a year or so. "Deep discharge", as the Optima site points out, is less than 60% charge left - ie leave the lights on till the car just barely starts. The Optima Red top is this type of battery.
"Deep Discharge" lead acid batteries are designed to withstand this type of treatment. Their life will still be shortened, but not by much. They are not very good at high current discharge. It can damage them, and shorten their life. I'm talking a discharge current number equal to or greater than the battery amp/hr rating. For a battery found in an RX-7 or RX-8, that would be a current greater than 50-70 Amps. To draw that starting a rotary, the temp. would have to be below about -20 C (or about 0 F), or you'd have to have very heavy oil in there.
The Optima Yellow top is this type of battery.
Just for reference:
RX-7 max. starter current = 90 Amps (typical less than 50). RX-8 is the same.
So, my answer would be yellow top would be fine, red top also fine. There is a "small" Optima now available as well.
If you want to extend the life of your battery, "improve" weight distribution, and make working under the hood easier, install a larger Optima in the trunk. Also frees up room for a blower
From someone who has lived in "winterville" for 30 years:
Regular lead acid batteries are designed for high current discharge, but meant to be kept at least 60% charged at all times. If you "deep discharge" them, even once, their life will be shortened. Repeated deep discharges will kill them within a year or so. "Deep discharge", as the Optima site points out, is less than 60% charge left - ie leave the lights on till the car just barely starts. The Optima Red top is this type of battery.
"Deep Discharge" lead acid batteries are designed to withstand this type of treatment. Their life will still be shortened, but not by much. They are not very good at high current discharge. It can damage them, and shorten their life. I'm talking a discharge current number equal to or greater than the battery amp/hr rating. For a battery found in an RX-7 or RX-8, that would be a current greater than 50-70 Amps. To draw that starting a rotary, the temp. would have to be below about -20 C (or about 0 F), or you'd have to have very heavy oil in there.
The Optima Yellow top is this type of battery.
Just for reference:
RX-7 max. starter current = 90 Amps (typical less than 50). RX-8 is the same.
So, my answer would be yellow top would be fine, red top also fine. There is a "small" Optima now available as well.
If you want to extend the life of your battery, "improve" weight distribution, and make working under the hood easier, install a larger Optima in the trunk. Also frees up room for a blower
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If you want to extend the life of your battery, "improve" weight distribution, and make working under the hood easier, install a larger Optima in the trunk. Also frees up room for a blower
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That's why it's in quotes. Some 3rd Gen RX-7 owners (a car also with 50/50 dist.) claim it improves it (but they put it in the cab on opposite side from driver in storage bin).
Main effect is to move weight closer to c/g so the car will turn faster.
Main effect is to move weight closer to c/g so the car will turn faster.
#21
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Originally posted by RX-8 friend
If you want to extend the life of your battery, "improve" weight distribution, and make working under the hood easier, install a larger Optima in the trunk. Also frees up room for a blower
If you want to extend the life of your battery, "improve" weight distribution, and make working under the hood easier, install a larger Optima in the trunk. Also frees up room for a blower
#22
sorry folks if this is a dumb question, but what ive drawn from this thread is the red top has more power but the yellow top has more longevity, is this correct if not could some one break it down im not sure im grasping which is better for the 8 thanks in advance
#23
Thews8
ok .. just got my red top 75/35 installing it now.
Gunit the red top is a better cold craning battery. the yello is good for starting when the battery is almost dead.
But there both great batteries. Still buy the red top.
Gunit the red top is a better cold craning battery. the yello is good for starting when the battery is almost dead.
But there both great batteries. Still buy the red top.
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Originally posted by thew
ok .. just got my red top 75/35 installing it now.......
ok .. just got my red top 75/35 installing it now.......
rx8cited