A brand of portable, wireless phone chargers sold on e-commerce sites including Amazon.com is being recalled over fears that its internal lithium battery can lead to potential fire and burns, the U.S.

Fast chargers can cut downtime on cordless tools, but many users wonder whether that extra speed comes at a long-term cost to battery lifespan.

Fast charging is convenient, but it raises questions about heat, battery wear, and long-term iPhone health. Here's what actually matters and why.