Ran a dual battery setup in my S4... was easy. Ran a PAC relay from the main battery to the rear setup with a battery isolater. Battery charged when the stereo was on, and stereo was only powered by the Optima yellow top in the trunk.
I've had an Optima ever since and never a problem...
I have a blue top (couldn't find yellow locally) and I love it. Damn battery box doesn't though (had to chop it up and piece it back together to make the battery fit).
Optima batteries are some of the best batteries you can buy. THey are gel cell batteries, not like a conventional dry cell like in your car now. They are also deep cycle batteries, sealed so they never leak, and have 2 sets of battery terminals. They are practically indestructible.
That's all I'll run in my aircooled cars. They're not exactly light, but you can mount them sideways and they'll never leak. Those 2 features alone are worth the price of admission. Rust sucks and so does battery acid.
spend the $100 on an optima its well worth it
Optima Yellow Top. You can play the stero (amp/sub) all day and the car still starts. I've done it
The VW battery tray in the 91 GTI is trying to eat my Optima The little bracket that stays in the car that normally holds the bottom lip of the battery is cutting through the case of the Optima because of the 6-pack design of the case. I had to use a small section of wood to put between them to keep it from cutting it any worse. The tie down bracket that can be removed from the car doesn't fit the Optima very well either, again because of the the 6 pack case shape. I had to use a grinder wheel to grind a section out of the bracket so it would fit around the cylinder shape of the case.
FYI New optimas are the suck. Good luck though.
I just popped the plastic bottom edge off the factory battery and put it on a new replacement one from Autozone for something like $69. Same size and fit and post placement as factory Varta but made by Johnson Controls (I think). I personally would not buy another Optima. In the four-wheeler world, I've heard many complaints of premature failures. I've used red-tops as well as yellow-tops in my Land Rover and had to have them warranteed within 2 years of purchase due to sudden failures.
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