iPhone battery not working: How to fix or repair faulty iPhone battery

While the iPhone is generally thought of as a great smartphone, battery life is one area that seems to let Apple's iPhone down - especially with recent reports of faulty batteries used in specific models of iPhone 6s. But what can you do if you've got a faulty iPhone battery? What if your iPhone isn't included in Apple's replacement programme? Here, we tell you about the various ways to fix a faulty iPhone battery