The battery in my RX-7 died... again (I had it recharged, but it didn't hold the charge for very long). It's a massive ~40lb. 35-series battery so I would like to replace it with a lighter battery. The car will see 3-season daily driving and autocross duty and be stored in the winter. The RX-7 is a battery hog so something with a decent amount of juice is required. Any suggestions?
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March 9, 2010 4:13 p.m. RexSeven Dork
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March 9, 2010 4:19 p.m. bigbens6 New Reader
Yellow top!
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March 9, 2010 4:31 p.m. WilberM3 New Reader
The Odyssey PC925 series is a pretty ballsy battery. http://www.odysseybatteries.com/battery/pc925series.htm
i've got the smaller pc680 in my M3 and i love it but youve got to be a little careful about lights/radio as its really a motorcycle battery. but the 925 is much bigger and still only 24 pounds. i found mine online for a lot less than their website's msrp too.
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March 10, 2010 4:02 p.m. RexSeven Dork
I'm interested in the PC925T battery WilberM3 suggested, but there is a problem. It is much shorter than the stock battery (5 9/16" tall vs. 8 7/8" tall) and the battery box and hold-down are too tall for the Oddy battery. Will a wood block underneath the battery to rise the height pass a typical SCCA Solo tech inspection or will I need to get a different battery hold-down?
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March 10, 2010 5:20 p.m. P71 SuperDork
Different hold down.
+1 on an Optima though. The one for the Miata is tall but skinny and lighter than the lead acid or OEM style batteries and it has more than enough juice.
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March 10, 2010 10:26 p.m. WilberM3 New Reader
In reply to RexSeven:
since its a sealed cell battery you can mount it in any orientation if the other dimensions work with the stock holddown. or you could always just make a new one.
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March 10, 2010 10:38 p.m. oldtin Reader
On the GRM side of things - find an interstate distribution center - new, cosmetic blemish batteries are $20
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March 10, 2010 10:49 p.m. 2002maniac Reader
My redtop has been going strong in 4 different cars since 2004. Despite being deep discharged several times it still cranks out tons of juice.
I'm not sure they still make them like they used to though.
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March 11, 2010 8:16 p.m. impulsive New Reader
check out Braille
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March 11, 2010 8:46 p.m. mad_machine SuperDork
I run the PC925 in my Ti.. GREAT battery. I think I might move it to the saab and drop in the 680
