Skoda India — skoda rapid new car battery

Address: Bangalore India

I see that my car battery is gone in 2 years and service center is telling to replace the battery. Wen the vehicle was delivered i was told there is a 4 years guarantee.
Skoda is misleading customers by saying that there is 4 years warranty for components and not giving same warranty for battery as lot of components depend on it.
If battery is generic third party component where warranty cannot be increased then i should be allowed to buy it from vendors other than service center without making the warranty void for electrical components. This is because the service centers charge high prices (Close to 8000rs + pick/drop charges 1000rs) the battery outside will be replaced at my site at close 5000 rs with 4 years warranty.
Though vehicle is good i am thinking not to recommend this to anyone since the service is very bad.