please help! upgraded Amp now what?

[duro78 10+ year member]

I have a 350z with the big 3 done (0awg), Alt 110 amp and an optima up front for now Im running a bxi 1608 and the a 4ch (check my sig) I have 0 dimming and even at full tilt it doesnt go anywhere close to 12v but at best that amp puts out 1250w and cant get my dual re sx10's really going so I ordered an AQ2200. I dont listen while car isnt on and only listen to music at 3/4 - full for about a song or 2, five minutes at the most so waiting for the alt to charge in between is no problem. Just bought the yt not too long ago so getting rid of it isnt an option plus not much can fit up front. So what would you suggest as a second batt as far as size. Thanks

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