im in need of a new battery since i dont have one i was thinking of going with a smaller battery but at the same time i have concerns with it powering my system and without dying on me. the battery im looking at getting is the NRG battery. heres some specs on it.

my system will be running 4-500 watts


NRG-CELL Racing Batteries have arrived! A Heeltoe Automotive exclusive, NRG-CELL batteries will save an unbelievable amount of size and weight under the hood of any car! Measuring a mere 3.25" wide, 6.875" long, and 5" tall, and weighing in at a paltry 11.5 lbs, this battery wants a home in every race or sports car. The NRG-CELL battery is a totally sealed 12-volt dry-cell lead-acid battery. One NRG-CELL battery will start any 4-cylinder, most 6-cylinder, and a many 8-cylinder vehicles easily numerous times successively as it provides a full 400 Hot Cranking Amps and approximately 250 Cold Cranking Amps.

 

I suggest you not get a battery.....a second battery is mainly used for playing a system with the vehicle off...i suggest you get capacitors...they're great for keeping the power to the amp while the car is on.... or get a combination.