sinkas

Hi All
My car came with a very expensive Japanese odyssey battery relocation kit un fitted,
Has anyone here got any long term use comments, as most mentions in threads dont seem to positive?
My car is driven 5 days a week.
It rarely gets beow 10c here in winter, should i try an odyssey?

9krpmrx8

iTrader: (46)

I can'y say about the 680 but I have run the PC925 for 4 years or so. Two other buddies run the PC925 as well. If it's driven it will be fine. Mine doesn't get driven daily and it stays on a float charger.

Does it put it in the trunk? her in South Texas being trunk mounted helps big time. Heat kills batteries.

sinkas

No its a box to replace winsheild washer bottle, has integrated oil vatch can and wiper fluid bottle

acroy

I ran the 680 for a couple years in an FC, no issue. Like it a lot.

Brettus

iTrader: (2)

I run the 925 as well but wouldn't run the 680 myself unless it was a dedicated track car . These cars need a battery with something in reserve and the 680 doesn't have that . One day it will let you down.

TeamRX8

iTrader: (25)

I had too many issues with the PC680 even for competition use. It's not rated for being exposed to rotary engine bay temperatures which will shorten it's useful life significantly (might be ok in the factory enclosed battery box with the fresh air vents still connected, but still borderline IMO). It also doesn't have enough charge capacity either because the Renesis needs good cranking power. I always had to keep a charged up battery jumper box handy. An equivalent Braile battery was as bad or worse.

Brettus

iTrader: (2)

FWIW , I run my 925 in the engine bay and fitted heat shielding around it . Seems good as new after two years of use .

sinkas

Cheers for the input, so does the rx8 need mire bettery than the fc?

dannobre

iTrader: (3)

Yes...the electric power steering pulls a lot of power.

I was having issues with small batteries on track when the steering was being used a lot. The battery couldn't keep up and I was having strange ignition problems that went away when I went back to a full size battery
​​​​
​

TeamRX8

iTrader: (25)

A PC680 only has 170 CCA and a 24 minute reserve capacity, a PC925 is 2x more for both. The max temp limit for the Odyssey battery is 176*F (80*C). Deep discharges are more likely with the smaller battery, which will contribute to a shorter life too.

Dropped $550 on a Voltphreaks high capacity racing battery in 2010. That was a special half price deal then, a new one is now $1350. 10 lbs installed and 1200 CCA. Still going strong in my trunk, which any of these style batteries will be happier and live longer there than in the engine bay. Has never let me down, which made my life much easier after dealing with the little PC680/equivalent pos batteries. Eat several of those plus the headaches and $550 looks like a steal in comparison.

Steve Dallas

I have a PC680 mounted in the trunk of my Miata. It does fine in that car, but I wouldn't even consider it for the RX-8. Not enough cranking amps, not enough reserve, and not enough heat tolerance. Maybe a trunk-mounted 925, but that isn't worth the effort to me.

Reoze

That's only if you buy the MJ version. The non jacketed version is 113F. That means you absolutely cannot stick one under the hood unless you buy the jacketed version. Which from what I've seen prevents many of the mounting brackets from fitting properly.

TeamRX8

iTrader: (25)

Thanks, that slipped my mind. I had the jacketed higher temp version they still only lasted a year or less.



.

Reoze

Yeah, when my IAT's are in the 130-140's. I wouldn't feel too great about sticking something with a max temp of 170 under the hood. Not too surprised it was toast that quickly.