A device has been pulled from service and contains one tadiran tl-4920/s, 3.6 volt 8500mah c lithium battery. The device was designed for a 20year life and have been pulled from the field within the first 0-3 years. Two styles exsist: battery encased in plastic or gel. Samples available. Estimate +250,000 available over next 1.5 years. -