Battery OPTIMA or AC DELCO

optimas are good. thats what i use

optima blue tops are marine-think of blue water and yellow are deep cycle 2] having the ground LARGER than the power is ALWAYS better in terms of car audio- electrons move negitive to postive , if my amp takes a 4 gauge wire for power the ground gets a 2 guage, this alone has gotten rid of some of my dimming

I have had a red top 34R in my R32 for almost 2 years now, no problems at all.

Red Top, 4 years so far. Survived 3 Portland Oregon winters, a few complete drains, and sites for a week + at a time without use. Way to heavy though.

I ran red top for a little more than five years before it ran out of juice, so I bought another a couple years ago

I bought a optima in 2001 and ran it for 6 years no problems, even though i drained it multiple times. I bought a replacement in 2005, exchanged on warrenty in '06, and i'mlooking for a replacement currently. i know optima was bought out a few years ago i wonder if quality has gone down since then.

Unfortunately, I only ran that battery for 10 months.....car was stolen, so I can't say it was great for many years, but in 10 months time, not one hick-up......even when my Autolamps Online HID kit went haywire and turned itself on and stayed on ALL NIGHT.

Optima Yellow top is pretty good. Avoid the Red Top's like the plague.

I compared the dimensions of both batteries (stock vs Optima) and the Optima is shorter, skinnier, but like 1/4 wider. Optima did not fit, or would not fit without modification to the positive terminal. Ordered the OEM from Keffer.

For the price you pay if you aren't using the car daily, it is a waste of money. I've been through 3 of them now, 2 of which I replaced within there crappy 1 year replacement period.