40LF220 – SAFT

The SAFT 40LF220 is a primary lithium-thionyl chloride (Li-SOCl2) battery designed for high energy density and long-term operation in demanding environments. This cylindrical cell, likely a standard D-size form factor based on industry convention, provides a nominal voltage of 3.6V and a typical capacity around 13Ah, though the exact value depends on discharge rate and temperature. The 40LF220 utilizes a bobbin construction, maximizing active material volume for extended service life, often exceeding 10 years under low-drain conditions. Its hermetically sealed construction and non-aqueous electrolyte enable operation across a wide temperature range, typically -60°C to +85°C. Due to the inherent chemistry, the 40LF220 exhibits a passivation layer that forms during storage, potentially causing a voltage delay upon initial discharge. This battery is commonly employed in applications requiring autonomous power, such as utility metering, tracking systems, and emergency backup power.