If your iPhone 5 battery is acting up, it might be covered under warranty. For those who prefer to go it alone, iFixit covers the steps on how to replace the battery yourself. Not only are iPhone 5 batteries available for $10 online, the repair can take as little as 15 minutes if you're already comfortable working with your iOS hardware.
A few tools are necessary, including an iPhone penalobe screwdriver, Phillips #00 screwdriver, plastic opening tools and a small suction cup. Of course, iFixit sells a Pro Tech Toolkit designed to help the intrepid do-it-yourself fan to open and repair a multitude of modern electronic devices. These items can also be purchased individually to help safely gain access to the insides of your iPhone 5.