Seiko 8F35 Instructions Manual page 18

Ex.) Expected time for battery change: April through June, 2007
Battery life indicator
When the second hand starts moving at two-second intervals instead of the normal
one-second interval, replace the battery with a new one as soon as possible.
Otherwise, the watch will stop operating in two weeks.
* For safety's sake, never use the watch for diving while the second hand is moving at two-second
intervals.
* When you make a long voyage, check the expected time for battery change referring to " Expected
time for battery change" above, and replace the battery with a new one if necessary before setting off.
* The time accuracy is not affected even if the second hand is moving at two-second intervals.
* While the second hand is moving at two-second intervals, the date will not change and the watch will
not show the calendar even if the crown is pulled out to the first click.
18
Each graduation of the scale
represents three months.
Year (2007)
" " mark showing the expected
time for battery change