I just had to replace the battery (40R) in my GT500. Left the doors open while cleaning and it never really came back to life after that so it was somewhat my fault...caused an early death. I have been buying the Samsclub Duracell batteries for my cars and I seem to get at least 6+ years out of them (3 year warranty). So far the Duracells have repeatedly given me the longest life out of all the other ones I have been through . Warranties are basically useless since most car batteries last 3 years. At Walmart I would swear their 2, and 3 years (the Maxx batts) look identical and probably are. You are paying extra insurance for that extra year but when that's up it makes no difference...no pro rating. I always use NOCO pads on the terminals - never have any corrosion.