As with all batteries, it depends on the warranty you get. The industry still has not figured out why some batteries die after a few weeks or last for years and years, hence the warranty programs that all manufacturers sell. Each model battery has on the average three grades of warranty at increasing price points. Remember that one of the important points of a warranty may be accessibility, purchasing from an outlet with multiple stores across the nation might be a plus to a coastal cruiser. There is only a handful of manufacturers and they sell private label to multiple marketers.