Quote Originally Posted by Mike52 View Post
Joe, welcome to CHR. Our good friend Roger, aka rspears, mounted the battery under the dash on his '33. I think he posted some pics in his build thread, Followed Me Home, '33 Build. He also had a thread regarding what he learned about charging these AGM batteries, AGM Battery Carger Question. Hopefully these 2 links will help you.

Mike
Mike, you beat me to the punch, again!! Welcome to CHR Joe! Like Mike says, I ended up using an XS Power D680 which is the same case size as the Odyssey PC680 AGM « XS Power At the time I bought, the XS Power units had some pretty good specials going, including free shipping and a free metal mounting case when you bought one of their "packages". Nathan at XS helped me a bunch, and he's posted here a few times, but not lately. You can reach him via e-mail, nathan@xspowerbatteries.com, or call their tech line from the website and ask for Nathan. Like Mike says, I mounted mine centered under the dash to minimize cable length, and put bulkhead fittings tucked into the kickout on the passenger side, hidden from side view, and only about a foot from the starter. Mine is cranking a 347 stroker running 10.3 CR, and knock on wood it's never failed me yet. Don gives a good testimonial for AGM's, too. Not sure about Odyssey, but I use a Battery Tender Plus on mine and it works great (after finding/fixing a bad fuse connector from the factory...) The critical thing with AGM's is that you not allow them to be pushed above 13.8 to 14V or you'll cook the acid from the mats and it cannot be replaced. Nathan will tell you all about chargers, too, including the high capacity units that they use to crank up batteries between runs on racers. My alternator is a 100A unit too, and I have not taken any steps to lower the voltage and have not seen any negatives to date. Look at the links, and if you have questions post them. Lots of guys have been using the AGM's here.