When a rechargeable lantern has the ability to charge external devices, it is often known as a power bank. This is usually a simple USB type input that allows you to use the stored power to charge things like cell phones, laptops, and tablets. However, just because a lantern is rechargeable does not mean that it will automatically be able to charge your phone. Be sure to check the product specifications to make sure you are getting all the features that you are looking for.