Harley FLSTF Fat Boy Softail 1340, 1450, 1584, 1690 500cca RG20L-WS 20ah High Performance Sealed AGM Motorcycle Battery Extra cranking power Increased service life Impact resistant case and cover Every Battery is fully charged and tested before it leaves our warehouse. An analysis report is included so you can be confident your battery is ready to go. Our batteries feature AGM construction. AGM stands for Absorbed Glass Mat; this is the latest technology in battery production today. AGM construction gives you a completely sealed liquid-free powersport battery which will not leak or corrode.