Does Apple still offer free replacement of Swelling batteries?

I recently acquired an iPhone 5s. After taking it home and getting a new SIM card for it, I noticed that the display in the top right corner was popping out. After looking around on Google, I believe that this is an effect of the battery swelling. Also, looking at these forums, I noticed many people were able to get a free replacement even if their phone was out of warranty. Will Apple still give a free replacement or will I have to replace the battery myself?