"Now with USB-C! 1 hour charging time and consistent 1.5V are game changing. Stop buying single-use batteries and get a modern solution. Designed for performance, convenience and reliability. Our rechargeable AA batteries will help you reduce waste, save money and save time. Fast Charging Lithium Battery 1000+ Charge Cycles  Convenient USB-C Charge Port Use the included cable to charge four batteries at once. Built-In LED Charging Indicator Paleblue Batteries let you know when they are fully charged. On-Board Smart Technology Provides Safe Charging No more batteries ruining expensive electronic devices!"