Should i add more batteries

replace redtop with agm sell it for $100 if not to old (be great if the agm u have will fit for start batt).. and try 1 or 2 more better batterys for rear..

That Redtop is junk. Sorry but a lot of us know that Optima isn't the same as they used to be...assembled/made in Mexico now.

Something isn't right....so your pulling about 350 amperes...where you coming up with 4k+? Are you running 2 Skar amps? I wouldn't trust some of the car audio apps out there. Jeff knows which are the legit ones.

Need more info...what's the vehicle? What brand of HO alt you have now? What issues/problems are you having? Is the big 3 done? A few extra batteries should be fine, but you have 2 already....perhaps one more wouldn't hurt but a total of 8 batteries, isn't needed.

you need 43.6 batteries for that setup (kidding)

You won't ever see 4000W out of all that if you were hit by lightning.

Are you having problems now? What are you trying to do here?

I suspect a 55AH secondary battery + upgraded alternator is adequate. I wouldn't throw away the battery under the hood if it still load tests good, but do keep an eye on it (have it load tested at least once a year).

As said, it should’ve more then fine now. Any issues you are having is something else. Gains or grounds

what are your volts dropping to with system on? if not low don't mess with it..

Optima red tops are starting batteries, not deep cycles. They are made for quick bursts of power (starter) not to be discharged and recharged constantly like what an audio system does.