Audi India — audi a3 battery failure without any prior indication

Address:

East Singhbhum, Jharkhand, 831005

Audi a3 bought in june 2015 from ranchi. Suddenly the car did not start yesterday morning. Contacted excide battery help line, they visited and checked the battery and reported for replacement.
I fail to understand that i did not get any indication of the battery weakness and it suddenly failed one morning. There are so many features and indicators in the car but what is the use if timely indicator is not flashed.
Had this event happen while on trip, it would have brought me in great inconvenience.