The expected life of the battery is approximately eight months, based on typical use. If the watch is used to time a short duration (or left running) on the repeat function with vibrating alert, then the battery life will be significantly shorter due to the higher battery requirements for vibration. If a spontaneous watch reset to original factory settings occurs, there is no backlight or a dim display, please replace the battery.
WARNING! INGESTION HAZARD: This product contains a button cell or coin battery.