A mobile charger, also known as a phone charger or smartphone charger, is a device used to replenish the battery power of a mobile device such as a martphone, tablet, or wearable device. Mobile chargers come in various types and formats to suit different needs and scenarios. Here's a general description. Some mobile chargers are designed to be compact and lightweight, making them easy to carry in a bag or pocket for use while traveling or on the go.