Replacement Battery Pack Lithium Battery Life 3 yr Color Black For Use With Mfr No TX1-1 TX1-2 TX1-4 TX1-5 Operating Temp Range -4 Degrees to 122 Degrees F Voltage 3.6V DC Includes Primary Lithium-Thionyl Chloride (Li-SOCl2) Battery 1.5AH 2/3AA Replaceable Non-Rechargeable