Do not buy this battery. The made in USA is now made in Korea. Plus- they did not drop the price.You need to add the acid before using it. Make sure you are wearing work pants/shirt/shoes and have plenty of rags. You will spill the acid.Also- they do not supply the yellow cap that you insert the water sensor. I will need to call them and have them mail it.Lastly- the first battery only lasted 4 years. I will not buy this battery again or any of Watchdog products. They made the unit so you need to buy their junk battery. A good AC Delco marine deep cell battery will not work with their unit and the AC Delco battery should last over 7 years without adding water every two months!!!!However, you could have them upgrade the unit so it can use a marine deep cell bettery.