Tool · Battery Estimator
When does the quartz need a battery?
Estimate remaining battery life for a quartz Seiko from its caliber and last change date — and set yourself a reminder.
In the workshop
Caliber-based life
Typical battery life per quartz caliber, from the database.
Last-change tracking
Enter when it was last serviced for a remaining-life estimate.
EOL behaviour
Notes on end-of-life seconds-hand indicators per movement.
Reminders
Optional calendar reminder before the battery is due.