Quick view Alti-2 Altimeter Neptune 2 Battery - CR2450 3V Alti-2 Altimeter Neptune 2 Battery - CR2450 3V Voltage: 3 Volts Capacity: 620mAh Chemistry: Lithium Dimensions: 24.0mm x 5.0mm Replacement... MSRP: Was: Now: $2.75 Add to Cart Compare