Which batteries does my thermometer use? October 26, 2020 21:09 Updated The MOBI Thermometers use AAA (Triple-A) Batteries, 1.5V standard voltage. Related articles Recalibrating Your Thermometer What should a normal temperature look like? Why does the thermometer read "LO"? Does my MOBI Thermometer have a warranty? Mobi Non-Contact Thermometer - Setup Guide