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Light Weight Batteries

Old 06-06-2015, 11:18 AM
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Light Weight Batteries

So my POS AAA battery that came in my 8 is finally dead. I want to throw a lighter battery in there and was wondering which would really be the best choice. I have seen mention of a few different ones(Odyssey PC680 battery, Braille, etc.) in and out of other threads.

I am wondering what spec I am looking for or which would be the best choice, since during my search I found mention of needed a decent amount of CCA for the RX8 over other vehs. It will be staying in the engine bay, so it needs to be Lead Acid/AGM due to heat.

Braille B129 Advanced AGM Upgrade GTX12-BS

Odyssey PC680

Tirerack listed this one, but no idea what part # it is. different specs from other Braille (I officially hate TR's new website)

Reg Braille line up
http://www.jegs.com/p/Braille-Batter...rPage=60&pno=1

looks like the is also CF versions too from Braille http://www.jegs.com/p/Braille-Batter...rPage=60&pno=1

It is my daily and I will be putting a battery tender on it too, as that will most likely be needed.

Any help would be great as currently the car is dead, so I need something soon.

Last edited by Tofu*Monster; 06-06-2015 at 11:33 AM.
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Old 06-06-2015, 11:49 AM
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After trying to compare a few it looks like the CF versions are just cosmetic, there are similiar specs and weights from the normal Braille series.
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Old 06-06-2015, 12:34 PM
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I run a PC925 relocated to the trunk. It is not the lightest battery but it is a lot lighter than the one I had and it performs well. The smaller ones are a PIA IMO on a street car. My buddy also runs the PC925 and Hoss-05 runs the Odyssey 35-PC1400T but you don't save much weight there.

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Old 06-07-2015, 10:26 AM
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CCA > Minimal Weight Savings

You can save all the weight you want, but your car cranking like a '67 VW beetle is embarrasing.
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Old 06-07-2015, 10:37 AM
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Originally Posted by 9krpmrx8 View Post
I run a PC925 relocated to the trunk. It is not the lightest battery but it is a lot lighter than the one I had and it performs well. The smaller ones are a PIA IMO on a street car. My buddy also runs the PC925 and Hoss-05 runs the Odyssey 35-PC1400T but you don't save much weight there.

Seriously .. BOING!!!!!

Dammit why don't I live in SARX
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Old 06-07-2015, 10:37 AM
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This was all answered in the other battery threads
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Old 06-07-2015, 05:00 PM
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Sweet setup 9k, I just don't want to relocate.
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Old 06-07-2015, 10:05 PM
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I tried PC690 and it worked fine. However, it is easy to drain the battery if you dont use the car often or leave the key in the ignition for too long, etc.

Best to keep it on a trickle charger when not in use. These batteries do not like the heat so best to get the battery relocated.
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Old 06-08-2015, 12:32 AM
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My battery is relocated and it makes it so much easier to work under the hood. There's also space to store frozen foods so they thaw out pretty quickly.
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Old 06-08-2015, 04:58 AM
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Originally Posted by Tofu*Monster View Post
Sweet setup 9k, I just don't want to relocate.

That and the end result was also covered.
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Old 06-08-2015, 11:05 AM
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TX

Originally Posted by Tofu*Monster View Post
Sweet setup 9k, I just don't want to relocate.
Thanks, I plan on some slight changes to clean it up a bit but it has worked great so far. Texas heat + turbo rotary plays hell on batteries so this was a must for me.

Originally Posted by Legot View Post
My battery is relocated and it makes it so much easier to work under the hood. There's also space to store frozen foods so they thaw out pretty quickly.
Yeah I don't know why I didn't do this years ago. Even with a properly thought out setup it is very easy to do.
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Old 06-08-2015, 06:29 PM
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after the reply's and reading through the other threads more, I decided to save the $$ on the battery and put it into a different area of my STX build. NOt sure what yet, still researching at this point. Thanks guys
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Old 08-31-2015, 12:08 PM
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I'm running PC680 in the same battery location. As relocation of the battery to the trunk will disqualify me from RWD street-class time attacks.

Cranks well, but if the battery is connected and you don't move the car for 2+ days, the battery will be drained.

Anti-gravity Lithium Battery will be a good alternative.
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Old 09-08-2015, 11:23 AM
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Well my battery died last week, a few days before I was heading to the track... Tirerack had free next day shipping to my zip on a 17 lbs lightweight racing AGM Braille battery so I went for it. Would have picked the 21 lbs version, but was not in stock.

Fit into the stock box rotated 90 degrees (so snug left and right, but space in front and behind). Used the included J-hooks (as they have more thread which is needed to get lower), the factory metal clamp, and cut the sides of the box a little so I could route the cables to the lower battery posts.

Works like a champ and did not budge while pulling as much as 1.4G under braking and through the turns.

Will see how it lasts. I guess I am looking at $200 every 1-2 years, rather than $150 every 5-7 years, plus needing to charge it, or at least leave it disconnected when I don't use the car for more than a couple of days. That seems a reasonable price to me to take ~19lbs of lead off the nose of the car.

Since the battery box is still basically stock, another option would be to pick up a full sized battery for daily use, and just swap in the Braille for track or auto-x weekends. I already swap wheels and brakes, but will see how this one holds up before going down that path.

Last edited by blu3dragon; 09-08-2015 at 11:29 AM.
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Old 09-08-2015, 12:25 PM
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Originally Posted by blu3dragon View Post
Will see how it lasts. I guess I am looking at $200 every 1-2 years, rather than $150 every 5-7 years, plus needing to charge it, or at least leave it disconnected when I don't use the car for more than a couple of days. That seems a reasonable price to me to take ~19lbs of lead off the nose of the car.
That's insanity.

Many Braille batteries are just over-priced, relabeled Dekas (though they swear they are not). Buy the Deka instead and save money. Also they should last 5-7 years easy or you are getting garbage batteries or not maintaining them (allowing them to discharge).

When you are not using the car, get an intelligent battery maintainer. Or a solar charger if you don't park in a garage/near an outlet. The 2 Amp Schumacher maintainers can be had for $25 from Wally World. There are "AGM-specific" battery maintainers that don't hurt, but they are not required unless you use crap AGM batteries (*cough* Optima *cough*).
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Old 09-08-2015, 12:59 PM
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^good to know, thanks. I needed one in a hurry and so did not do much research. I think I actually paid 180. It does look the same as the Deka and that would be much cheaper!

If I get 5 years out of mine, then I will be pretty stoked.
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Old 09-08-2015, 05:12 PM
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Since you failed to read the old threads, be advised that those batteries respond to the typical RX8 engine bay temperatures by losing capacity and/or having a short lifespan
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Old 03-11-2016, 11:31 AM
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Thank you for the info guys now I'm looking at getting a Deka, quick question though has anyone every played around with some sort of insulation for the battery so it does not get as heat soaked?
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Old 03-24-2016, 06:00 AM
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I use a U1R tractor battery. I've used this battery in 3 other cars as well for multiple seasons. Starts fine down in the 30F range. weighs about 18ish pounds. and very cheap.

Last edited by hufflepuff; 03-24-2016 at 01:57 PM.
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Old 03-24-2016, 10:07 AM
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Originally Posted by hufflepuff View Post
I use a U1R tractor battery. I've used this battery in 3 other cars as well for multiple seasons. Starts fine down in the 30F range. weighs about 18ish pounds.
really - this little $20 230cca job?
EverStart Lawn & Garden Battery, Group Size U1R-7 - Walmart.com
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Old 03-24-2016, 10:54 AM
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Old 03-24-2016, 11:05 AM
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I'm surprised the alternator isn't cooking the smaller capacity batteries. What kind of life do you get out of the battery since it likely deeply discharges during an RX-8 start.
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Old 03-24-2016, 01:54 PM
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The diehard is rated at 340 CCA. spend more to get the higher rated CCA versions.


I've had one in my integra NASA time trials car for 3 years going strong. Had one in the RX8 for about 6 months now. turns over the engine fairly strongly. engine cranks right up on cold mornings.

I know it seems small, but my integra, RX8, and old eagle talon never had issues starting under any circumstances. you'll find plenty of autocrossers using batteries such as this one, or smaller.

If you have low compression, maybe it's a different story since you need all the cranking power you can get, but for a reasonably healthy engine I've had great results.


I've also let the car sit for about a week and it fired right up.

Last edited by hufflepuff; 03-24-2016 at 02:00 PM.
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Old 03-24-2016, 01:56 PM
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Originally Posted by wannawankel View Post
I'm surprised the alternator isn't cooking the smaller capacity batteries. What kind of life do you get out of the battery since it likely deeply discharges during an RX-8 start.
Alternators are set to put out a specific voltage and to not overcharge the battery. they don't mindlessly keep pushing current.


in addition, cranking at 300A for 10 seconds removes less than one amp-hour, while the battery contains more than 30amp-hours, so you could do plenty of start attempts.
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Old 07-24-2016, 04:18 PM
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I have replaced the OEM battery with a Deka for Harley Davidson in the engine bay (-10kg).
No problems with engine bay temps or cranking (I don't live in Texas, NA engine with OEM runners).
The only thing to avoid is the battery fully discharge (i.e. in winter time) by using a battery charger/maintainer (like any gel battery) : if not you are ready for a battery replacement.
My car is not a daily driving one.
Presently there is not AC, nor alarm system but this modification has been made when the car were not that "extreme".
MTBF 2y without charger-mainainer, 3+(since the last replacement is the same) with.
This mod is not intended for cars exposed to cold winter temps for long times (i.e. parking the car outside at -10C for hours).

Best regards
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