Battery recommendations

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I'm planning a complete overhaul of my power in my car and the last thing I need is a battery. I have a 900watt rms 3800watt max system and was hoping for 80+ah. Does anyone have any cheap alternatives to xs power I'm trying to be under $300
I just picked up a die hard agm from advance auto this past weekend. That plus I upgraded my Big 3 with ofc wire. Seems to be doing the job so far.
 
What size underhood can you fit? Is there any room in the back for an auxiliary as well? I as well upgraded to diehard agm, then put lithium in the back. Titan 8 pwr-s5
 
What size underhood can you fit? Is there any room in the back for an auxiliary as well? I as well upgraded to diehard agm, then put lithium in the back. Titan 8 pwr-s5
According to AutoZone I can fit a group 35 and while I do have room for a battery in the trunk I'm trying to get away with just the one under the hood
 
Do you also monitor voltage at your amp(s)? it’s very helpful, I had my 160a alternator modified into a 326a locally here in Denver, it now does 14.5-14.8 at idle
 
Do you also monitor voltage at your amp(s)? it’s very helpful, I had my 160a alternator modified into a 326a locally here in Denver, it now does 14.5-14.8 at idle
Only gauge I have is a cigarette lighter one, but when I still had a cap I tested it again it and they had the same readouts
 
I was really happy adding an agm just before my smart 3, helped tremendously
 

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Loud(ish)_Geo

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