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Thats funny, my brothers friend also said (works at AutoZone) that the most returned battery's there are optima batteries (i think thats a bunch of BS)...i dont know what these people are doing either there liing and want money back or they have other problems and thought a better battery would fix there draining problem...my brother asked me and he knows i know my electronics stuff (Electronics Tech at my work), i had 3 optima yellow tops, in 2 different cars and my friend is useing one of my old ones i sold him, never had a problem yet, these battery's have a like 3 hr reserve capacity in them...i went to the mall once, left my lights on came out hrs later, and my lights where all still
bright, i didnt think i was going to start my car but then i realized duh, if my lights are bright obviously there's enough juice, started no problem... I have not herd anything bad about from anyone i know with these batteries.. i actually had a problem with my stock battery, i guess there is a little drain that i couldnt start my car after like a week or 2 of sitting, but the optima blocks out little draining if there is from the car, so it actually helps my car sit longer without starting it... OPTIMA'S ARE THE BEST ALL AROUND BATTERY !!!
If you want a crazy stereo then go with a drycell battery's and isolate them with an isolator...
My best advice... Alex LaChance