Seiko SQ100 - Alarm-Chrono-Timer, Cal. 7T42
I remember that I open ca. 100 of my
Quartz watches in November 2003
Suddenly I had the feeling that some of my quartz watches I had carried to Thailand from Switzerland around Easter 2002 might have leaking batteries. The "loss" was 1.5%, a TIMEX Indiglo from Prague got an acid damage but still works and a SEIKO 8M25 also got battery fluids and is probably dead. But I am still looking for the Cal. 8M25 and hope to be able to restore that SEIKO. I have not tried that 8M25 with the exact battery type yet since I did not have that type in stock in November 2003. But if the voltage is matching (most watch cells are 1.5 V), you can test a Quartz watch with any battery size. Just be careful if you insert too small batteries, the watch might run erratically since the too small or too flat battery will not always make good contact. Worse even, too high batteries might leak a lot easier. Because pressure on the battery case is due to my experience the single most frequent reason (besides age or sloppy manufacturing of course) for batteries to leak. The best way is definitely to get the proper battery type from a reliable manufacturer like Maxell or Renata.
When working on so many Quartz watches, I did not really care to create top pictures, I was rushing the shots and thus you will have to live with rather crappy pictures for now. At least the over exposure shows the movement in good detail. This one like 98.5% of all the Quartz watches opened in November 2003 showed no leaking damage. I think I got away with a warning shot. Thus I open and remove the dead batteries now as soon as I detect that the watch has stopped. Safe is safe!
PS The case is now cleaned. Favorites normally look a bit dirtier ;-)