Запросил Citizen. Вот запрос и ответ. Надеюсь, теперь он Вас удовлетворит
:
"Dear Citizen team,
Please help with question: what is the secondary battery life expectancy in years for Citizen Attesa ATV53-2831(2,3,4)?
Best regards,
Fedor
"
"Dear Fedor,
We would like to advise that the secondary battery,
would gradually decrease its chargeable capacity
approximately 20% after ran 20 years.
However watch needs periodic maintenance
due to oil deterioration. We recommend every five years this
to be done for preserve original performance.
With best regards
CS Support Team
CITIZEN Watch Company Japan
"
