Their iPhone 5 Premium Battery retails for about $7.99.
If you want the "gold standard" for DIY repair, iFixit is the place. where to buy iphone 5 battery
Amazon.com: Iphone 5 Battery Replacement. All Discounts. Up to $10. $10 to $15. Get It by Tomorrow. Amazon.com Their iPhone 5 Premium Battery retails for about $7
They offer a lifetime warranty on their "Premium Plus" line, which is a massive safety net for older tech. 4. Can You Get a Genuine Apple Part? with many including the necessary tools.
You can find various iPhone 5 battery kits often ranging from $13 to $15, with many including the necessary tools.