Upgrade our brightest headlamp with the Icon Rechargeable Battery. Featuring a sealed, waterproof Lithium Ion battery, this interchangeable accessory clips to the headband of the Black Diamond Icon Headlamp and has 5,200 mA hours capacity and can charge out via USB port. With a power level indicator and push button activated red flasher, the Icon Rechargeable Battery is a worthy addition for professionals and adventurers that demand reliable, high-output lighting.