Almost all bank insist on maintaining a monthly or quarterly average balance in your savings account.
State Bank of India customer holding savings accounts in Metro’s and urban center branches are required to maintain an average monthly balance of RS. 3,000.
The requirements drops to Rs. 2000 for customers in semi-urban branches and Rs. 1,000 for rural branches. The bank charges RS. 5-15 for non- maintenance of the required account balance.

While this seems nominal, some banks can charge as much as Rs.200-500.