@AkbarGr8, great going, I think I should also stay hopeful about the life of my City's battery.
I changed my Santro's battery in April or May 2005, and it has done almost 50K running since then, and battery seems to be going good. But to be on the safe side I was wondering whether should I get the battery changed or wait for it to die. How can I get an idea whether it is in weak state or still good enough to do few thousand miles as I do not want to wake up some morning and figure out that I am unable to start my car.