Piggyback charger doubles your runtime by charging a spare battery while you work (battery sold separately) Features a dual power input USB port or traditional AC/DC charging Integrated micro-USB interface specifically designed to guide the plug into place for a secure connection USB port provides a convenient charging option using modern devices Fully charges lithium ion battery in three hours The Piggyback style charger double run time by charging a spare battery while you work. Features a dual power input USB port or traditional AC/DC charging. Integrated micro-USB interface specially designed to guidethe pluginto place for a secure connection. USB port provides a convenient charging option using modern devices. Compatible with the Strion LED and the Strion LED HL series.