Description Manuals Videos Articles Clemco 24619 Replacement 3V lithium battery, (CR2450), for the Clemco CMS-3 and CMS-4 in helmet carbon monoxide monitor. CMS-3 Item # 7 Related Parts (1) Parts Included (1) CMS-4 CO Monitor, monitor only #29766 $673.87 1137 Customers Also Viewed Clemco CMS-3, In-Helmet, Carbon Monoxide Moni… #24613 $0.00 Clemco CMS-3, In-Helmet, Carbon Monoxide Moni… #24612 $0.00 Clemco CMS-3 Mounting Plate #25575 $35.39