Best source for Optima?

[jmatta]

I've had an Optima red top in my 911 for probably 5 years now. I never have to put it on a battery tender (I have a cut-off switch), and the thing always cranks without effort. I bought a Porsche replacement battery for my Box S from the dealer because I didn't want to deal with the hassle of making a mounting bracket. Other than that, I wouldn't have thought twice about putting one in the car.

[blue2000s]

I've had an Optima red top last for over 15 years in a car that was used only occasionally and never had battery tender. It was also run completely flat a couple of times while sitting in the car in the garage. I'm convinced that this is the most robust commonly available battery on the market today. The extra cost of an Optima is well worth the peace of mind for me.

There are a few online retailers that sell these batteries, including ebay. Just shop around for the best price (with shipping). The problem you're going to have is that the yellow top does not come with reversed poles like the red top, so you will not have enough cable length to reach both poles. You'll need to extend the cables or just get a 34R red top.

I mounted mine without adding a secondary tray. I just used the existing holes in the tray to hold the battery down with cleats.

[70Sixter]

This outfit was highly recommended for Optima mounting parts to me over a year ago. I have not yet dealt with them, so no personal knowledge.

http://www.yellowdogmotorsports.com/store.php

There have also been a bunch of DIYs on various sites.