Description Seizaiken SR521SW watch batteries, manufactured by Seiko Instruments Inc., are known for their high reliability, excellent leakage resistance and mercury free composition making them a popular choice for watchmakers and a good alternative to genuine Seiko batteries. Made in Japan Features Low Drain Type – Best used with analog watches A flat discharge curve during discharge supplies a stable voltage until the end of the discharge life High-energy density per unit volume provides 2x the amount of energy capacity as button-type alkaline batteries Seizaiken leak-resistant processing
