ive had my duralast battery since i got the car, ive put MANY cycles of being dead on it and it still holds up fantastic.......powering my stuff good for a long while now, dont see how its not killed yet, and ive had the car for a year, that battery is prolly older, i have a soundstream 1700d powering a sundown nightshade 18 and a sundown sax125.2 powering my dorr speakers and its still doin great.