my system will have 4 fi bl 18s, t4k rf amp, alpine 505 double din, rf compnents, h/o 300 amp alt. all 1/0 gauge wire subs 8 guage, stinger volt meter, big three, bulk order of hushmatt all this is in progress, and a 120 gb ipod. i was thinkin of going with sum powermaster batts or kinentic batts maybe the d3100 powermaster or the 2400 kinetic. how many do you think i would need i was thinkin maybe 3 in the back and 1 in the front. and am i misssing anything else just wondering what a mla moduale is too kinda new to this stuff but havin someone else do my install. so just give me any sugestions. thanks alot. i cant wait till i get all this stuff in my explorer .