800 Amps of current??? at 12V nominal??? it is about 10 kW of power!!! that is some serious power in a very small package...

if i were doing your audio setup with these kind of power requirements, i would definetely look into this particular battery as a second onboard battery. You will also need to consider the charging requirements for this battery, as the onboard alternator from V8 might not be able to put out enough juice to charge both batteries - even the watercooled alternator did not put out enough amperage... Also, I would keep the two power sources independent from each other - you might be looking into a separate charging facility for the little guy...

Ripster, this whole setup is getting on a different level of the engineering design - before going anywhere further, lets see what other members have to say about your setup...

it could be that somebody has done what you are doing long time ago with much less considerations and complications - in my line of work, we do outfit some of our vehicles with a second battery as some of our onboard equipment can pull a lot of juice, and a lot of our work must be redundant, to avoid malfunctions in critical situations - but our critical situations involve matters of life and death... in your case, this is just an Amp... that is why i think that my suggestions might be an overkill in your situation...

Let's see what other folks have to say - i am sure many people are just reading the thread without saying anything...