Skoda India — battery worn out

Address:

Mumbai City, Maharashtra, 400705

Hi team,
I am using skoda rapid petrol mh01byxx85 vehicle is giving me very good mileage of 12/13 in city and 15/17 on highways, which is more than expected.
Since last service (10 month ago) there is no any expenses, excepts one tail light reverse bulb replaced by jmd nerul, no labour cost only bulb charge of rs. 185.
However last sunday 18.11.2018, my vehicle was not starting, i called rsa, they also came promptly in an hr and vehicle jump started, and said its due to battery drained out.
Now complete week its fine, but some time i see battery sign in dashboard.
Vehicle is under warranty and excide battery replaced on 12.1.2017, so its still under warranty and should be replaced in warranty. I have also enquired with excide dealers and they said company gives 4- and 5-years warranty now days. So how less than two years battery drained out.
I strongly believe that it’s not skoda but vendor and dealers are not providing proper material/ service.
Nevertheless, i am absolutely fine if battery not getting replaced as per your any rules and regulations, i will change it my own, as i am completely satisfied with its excellent performance.