All ProductsSeikoElectromechanicalBattery Products SEIKO ElectromechanicalBattery ProductsBatteries Rechargeable (secondary) MS621FE COIN, 6.8MM 3V LITHIUM BATTERY RECHARGEABLE (SECONDARY) 5.5MAH MFR. Name: Seiko MS621FE-FL11E COIN, 6.8MM 3V LITHIUM BATTERY RECHARGEABLE (SECONDARY) 5.5MAH MFR. Name: Seiko