which secondary batt kit should i get?

[chevy_aveo_2005]

Wanted a capacitor, realized theyre no good. Now i want to add a second battery so i dont stress the system. Which kit is alright? Should i also replace the original battery as well? This is the last piece of my system i still need.

Pioneer GM-D8601 1600 Watt Monoblock ------ 4 ohms..300w rms....1600w peak

GM-D9605 5 chan----- 4 ohms... 600w rms... 2000w peak

the system consists of a component set in the front, a set of 8" mids in the rear and one 12" in the trunk. total rms is around 700 total for all speakers, and peaks around 2500.

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