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Battery change
The miniature battery which powers your watch should last approximately 5
years (Cal. 4F56) / 10 years (Cal. 8F56). However, because the battery is
inserted at the factory to check the function and performance of the watch,
its actual life once in your possession may be less than the specified period.
When the battery expires, be sure to replace it as soon as possible to prevent
any malfunction. For battery replacement, we recommend that you contact an
AUTHORIZED SEIKO DEALER and request SEIKO SB-T18 (Cal. 4F56) / SEIKO
SB-T19 (Cal. 8F56) battery.
＊If the watch is left with the crown at the first or second click, if the calendar checking function is
used frequently, and/or if the watch is left in temperatures outside the normal temperature
range (5｡ C ˜ 35｡ C or 41｡ F ˜ 95｡ F) for a long time, the battery life may be less than the
specified period.
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.
＊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.
＊If the watch is left in very low temperatures, the second hand may temporarily start moving at two-second
intervals and the date does not change to the next. When the watch returns to normal temperature,
however, this condition will be corrected and the correct date will be displayed on the next day.
If the second hand still moves at two-second intervals and the date does not change properly,
replace the battery with a new one.
・Checking and adjustment of the calendar after battery change The calendar
function is not affected by battery changes. However, after the battery is
replaced with a new one, be sure to check that the calendar is correct. (See "How
to check the calendar") If the watch does not indicate the leap year, month and
date correctly, have the watch adjusted by an AUTHORIZED SEIKO DEALER.
・Battery replacement is charged even if it runs down within the guarantee period.
・Once the case back is opened for battery replacement or other purposes, the
original water resistant quality designed for the watch may deteriorate when it is
closed. When you have the battery replaced with a new one, also request the
water resistance test pertaining to the water resistant quality of your watch. If
your watch has 10-bar or higher water resistant quality, be sure to have such
test performed on the watch every time the battery is replaced. Please note that
it takes several days to check the water resistant quality of your watch. When
requesting the checking, therefore, please check the period required for it.
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