Replacement Battery Kit for Scubapro Chromis Wrist-mount Dive Computer. Good to have it as backup, so by this way you will never have to cancel a Dive. The components are brand new, sealed and meet all factory specifications. Kit Includes 1x New 3.0V Lithium cell Battery for Dive Computer, 10 year shelf life (estimation). 1x New Hatch O-ring, which is neccessary to replace when you open the Battery Cover to prevent the Computer of Flooding 1x Display shield protector.