@Backwoods how did the battery hold up? I'm looking to do this with my 22' Bronco (stock 240amp alt, on about 1500rms total with sub amp at 4ohm). not running or even planning on doing anything crazy power wise, maybe upgrade sub amp and run like 3k watts in total. I don't really have room / set-up for more batteries so the only route I'm looking to take is replacing the battery under the hood, seems like the easiest solution for just 3k watts of power.