Battery issue in Macbook Pro 13 2012

My macbook's warranty expires in next 20 days. My battery life has reduced somewhat, so i downloaded an app to figure out the current battery health. The app shows :-
Current Max Battery  -  4610 mAh
Original Max Battery  -  5770 mAh
Which means my battery health has deteriorated by around 20%.
To confirm, i also checked in System Information. That also shows the same data.
So, is it possible to get my battery replaced as there is still few days left in my 1 year warranty or Apple wont consider 20% deterioration for replacement ??
Thanks
Kunal

Take it in to an Apple store or an AASP and have them evaluate it.  It will be their decision if a new battery is warranted or not.  The general rule is if a battery health is 80% or better, it still is serviceable.
Ciao.

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