Battery OPTIMA or OEM Audi

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.

have an optima red top it starts the car at -40 weather no problem, only catch is if you kill it the batt will never be the same iv gone through 2 so far in the last 2 years but with 10 year or more warranty who cares.

they used to be good but over the last 5 years or so they have dropped in quality. I have purchased 3 red tops and 4 yellow tops for customers and each one failed prematurely.

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.