I know you guys are predominately auto men but I got my 7548 out of the safe today to adjust the time and noticed it was showing the low battery sign
So popped it on the bench for a quick swap and was horrified to find the sight below -bear in mind the watery was still working -
Recently I’d switched to using Seizaiken (Seiko) batteries
Renata by biglewie, on Flickr
Trio now all back up and running correctly
Vintage seiko divers by biglewie, on Flickr