I have replaced the battery and got the answer. I have inquired about this, When you approach Hero MotoCorp service station, they will charge Rs. 1450/- for battery replacement while Exide battery outlet just install battery in Rs. 1100/-. This is the difference. Currently I have installed TATA Green Battery (Use Gel technology, not chargable) with the same price but with 2 year Guaranty and then 2 year service warranty.