When I replaced my original battery after 10 yrs. I chose to spend a little more and have a Delco dealer do it. 1. I think I got my moneys worth from the old one 2.Read on this forum about problems after done by owners 3.Seemed like it was hard to get to. Also after checking prices at auto part stores with free inst. this was one they wouldn't do! Must be a reason for it. Do most maint. on my vehicles but electrical stuff scares me!!!!!