if thats how you would rather do it. kenitic makes good batteries. basicaly as long as you have the ho alt your system will be powered while driving and the upgraded battery is just to keep it powerd for those short time periods while at stops signs/lights.
hn155: Rockford punch pro speakers, t400.4 deh 80prs, full audio build to come. working towards 175hp n/a, simple but fun.