Second battery options

[Lmobeats]

So I'm looking at adding another battery to my system. I'm running 2 audiobahn flame q 15s bridged into a 4000w amp. Due to low funds I am wondering if anyone could tell me if it was smart to use either a lawnmower battery or a deep cycle marine battery. Reason I am asking is because I already have these batteries at the house. Anyone have any input on this? I'm running stock alternator and a 650 cca car battery. This is all in a 98 4runner btw

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