Isbell was mayor of Pasadena from 1981-1985 and from 1993-2001 when he reached term limits. He was returned to the mayor's office in January, 2008 for an unexpired term and subsequently was re-elected to a full term in May, 2009.
These are nicads though, probably your gold cart is lead acid. If you find a good cheap local source of deep cycle 6 volt batteries, let me know. I'd say 7 years is a pretty good run for golf cart batteries, esp. if you ran them down several times. You'll do even better if you top them off at 80% or more.
The amount of time a golf cart battery will last depends on the quality of the battery, the climate, and how well it is taken care of. A cheap battery in warm climate will last 1-2 years, and in cool climate 2-3 years. A premium quality battery should last 3-4 years in a warm climate and 4-5 years in a cool climate.