Rivalry Emerges in Watch Industry Over Battery Power
New rivalry marks watch industry as battery powered timepieces push into main spring territory. Analysts note a small share of about 5 percent this year with roughly 20 million watches sold in the United States, while traditional self winding and mainspring models remain dominant. The battery watches use a cell about the size of an aspirin tablet to drive the balance wheel, promising about a year between replacements as makers emphasize compact energy cells expanding into devices once run by motors or hand power.