Welch Allyn Rechargeable 3.5v Replacement Ni-Cad Battery.
The Welch Allyn Warranty Welch Allyn will repair or replace, free of charge, any parts of its own manufacture proven to be defective through causes other than misuse, neglect, damage in shipment, or normal wear.
The Battery works! Replacing same model that lasted over 50 years.
Haven't used battery yet but fits item and was delivered fast. Light bulb evidently does not work so cannot say if battery is working.