Citizen C70 Instruction Manual page 25

8. Battery life: 2 years approx. (operating conditions; alarm sound: 20 seconds/
day, time-up sound in the timer mode: 5 seconds/day, EL light: 3
seconds/day)
* The specified battery assures the accuracy for 2 years when the
watch is used in the standard operating condition as mentioned
above. However, the service life of the battery differs greatly
depending on the frequency of use of the alarm, chronograph,
EL light, etc.
* Specifications are subject to change, for improvement, without notice.
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