EF651625-S4 is a Lithium-thionyl Chloride (Li-SOCl2) Battery manufactured by EVE as a direct replacement for Eagle-Pitcher LTC-7PN-S4 keeper batteries.
LTC-7PN-S4 Battery General Features:

• High and stable operating voltage

• Hermetic glass-to-metal sealing

• Stainless steel container

• Underwriters Laboratories UL Component Recognition