It will never need a battery replacement, which grants you the freedom to use the functions at will, without the fear of the power source running dry all in a sudden, unless you deliberately keep it in darkness throughout. Even then, a few minutes of exposure to bright sunlight is enough to get the Seiko Solar Chronograph Watch up and running. With artificial lights, it stretches to a slightly longer span.
http://citizenwatchesjp.inube.com/blog/7119561/seiko-sportura-world-time-solar-chronograph-ssc483p1-mens-watch/
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