Idk ive had good luck with my phones but I remember my bro's s3 batteries I ordered barely fit.
Just look on ebay apparently canadian companies are selling better ones now? Just remember 2 things, 1) you need a battery charger as well, 2) the batteries from ebay usually don't have NFC support. The canadian ones are 15 each but supposed to be better, china ones are 12-15 for 3 with a charger.