If you use an iPhone, it comes with several simple settings that can make your battery last longer for everyday use. However, if you have an extra iPhone or are upgrading to a new model and want to keep your old phone in good shape, what can you do to preserve its battery health? Fortunately, Apple has clear recommendations to protect your iPhone's battery life if it's going into storage. Apple says if your iPhone remains in a completely charged state for a significant duration, it'll impact the phone's battery health, and it may lose some capacity. Similarly, a completely discharged iPhone risks falling in a deep discharge state, which can cause it to stop charging at all, resulting in your iPhone battery needing to be replaced.