CR1/3N-FT , CR1/3N-SLF FDK Battery

Battery Attributes:
Voltage: 3 Volts
Capacity: 160mAh
Chemistry: Lithium-Manganese Dioxide
Weight: 0.01 oz (3.3 g)
Termination: 3 Pins (2 Positive - 1 Negative)

Spec sheet 

MSDS (Material Safety Datasheet)