All notched Power Cords are for 2081-03, 2083-03, 2084-04 Helmets and Helmets purchased after 2019 (often referred to as “Turn-Lock” Helmets), with 2500-36TSC and 2500-37TSC Batteries.
Notched power cords are backwards compatible with older Helmets and may be used as a replacement for the older, 2590-01 Power Cords.