Seiko 8F56 Manual - Page 19

English The leap second correction is executed every year or two simultaneously throughout the world on the basis of information collected by astronomical observatories all over the world. The correction is effected between 11:59'59" p.m. and 0:00'00" a.m. GMT either on December 31 or on June 30, during which one second is added or subtracted. When this happens, please adjust your watch accordingly. Please refer to your newspaper for information on the leap second. BATTERY CHANGE 5 Years [Cal. 4F56] 10 Years [Cal. 8F56] 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 CR1612 (Cal. 4F56) / SEIKO CR2412 (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. 19