I have been selling optimas for 10 years. The blue tops for some reason SUCK! They are identical to the yellow tops but they somehow die very quickly. Replace them with red or yellow tops and you will be happy. ***Stay away from delco batteries**** If you want to killer battery then get a few "workaholics" from interstate. They are the best battery ont he market and will take a serious beating! We use to use them in our hopping trucks and cars back in the day.