Tadiran SL550 half AA is a standard 1/2 AA size high-temperature lithium battery designed for low-current applications. This product excels in High-Temperature applications, as these cells have an operating temperature of -55ºC to +130ºC.
The SL-550 may also be known as the alternative part number TLH-5902. (Typical values for batteries stored at +25 °C for one year)