Aftermarket vs. Genuine iPhone Battery — What's the Difference? When your iPhone battery starts dying fast or your phone shuts off unexpectedly, it's time for a replacement. But one of the most common questions we hear at Bull City Mobile Repair in Durham, NC is: "Should I get an aftermarket battery or a genuine Apple battery?" Here's what you need to know. What Is a Genuine Apple Battery? A genuine Apple battery is the same battery that came in your iPhone when you