Is your iPhone 5 battery life bad? No, I don't mean "Oh jeez I have to charge it every night!" bad, I mean "Wait, it was at 100% when I unplugged it five minutes ago, and it's already down 15%" bad. If so, your phone might fall within a certain serial number range that qualifies for Apple's new battery replacement program.
To find out if you're eligible, head to your Settings menu, tap General and then About. Here you'll find your phone's serial number, so copy it down and enter it on Apple's eligibility search tool. If you're one of the "very small percentage" that Apple claims has a defective battery, you can get it replaced at an official Apple Store, or an authorized third party repair center for no charge. Hooray!