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Chronomaster: 4 1/2 sec band over 5 years with new movement; what do I do now that batty is dead?

1765 Views 13 Replies 7 Participants Last post by  Hans Moleman
I bought my Citizen Chronomaster through Katsu Higuchi in Japan in 2007. Subsequently I posted much data here at Watchseek showing how the watch rapidly sped up over time and way out of spec, repeating that bad behavior after going back to Japan for service. Finally Higuchi decided it needed a new movement and in fact after that it performed MUCH better. I'm enclosing a graph showing that in the ~5 years it ran on its latest battery the watch stayed within a 4 1/2 second band compared to UTC, although that would not have been true for much longer.

But now the battery is dead and the watch is out of warranty. Higuchi did not reply to my last request for information about how to get the battery replaced and the watch regulated.

I have two questions for you better-informed people.

1) How can I get the job done by Citizen, presumably in Japan?

2) I can replace the battery myself, and grease the o-ring. I can certainly NOT regulate the rate, and beyond that I'm worried that the rate and TC parameters might be stored in volatile memory and would be lost if the battery is changed. Does anyone have experience changing the A660 battery at home?

Any help will be greatly appreciated!
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I'm not sure what you have to loose by changing the battery yourself, your only concern would be introducing dust into the case and movement. If you change it and it returns to normal you're done.

I doubt if there is a unique TC curve for each watch, that it would be on the volatile memory would probably be even more unlikely. As far as the rate, possibly, but again probably more fixed because it just wouldn't make much sense to put it in the volatile memory.

If after the battery change, the rate requires regulation, contact your regional support center and ask them how to proceed. Like you said the watch is out of warranty, why incur costs and time before you determine you have to?
OP kind of curious what battery is in your watch, and if it is possible, do you plan to upgrade from the original equipment to something better. Again I'm not sure what it came with in 2007, but if it came with a 40 mAh, have you considered going up to 55 mAh to gain a little more battery life? I doubt that it would affect the rate, at least it doesn't seem to on ETA movements.
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