What type of battery does the Time Timer Watch use? October 11, 2023 13:57 Updated The Time Timer Watch uses a CR2032. If you need to replace your battery, you can view those instructions here. WARNING! INGESTION HAZARD: This product contains a button cell or coin battery. Related articles How to replace the battery. What size Time Timer Watch is best for me or my child? What is the duration of the Time Timer Watch alert at the end of a Timer or Alarm? Can I set multiple timers on the Time Timer Watch? How long does the Time Timer Watch battery last?