1) Take off white plastic cover so that the only metal cover is seen 2) Notice in upper right corner there is a "golden" pad - tiny one and in the metal cover there is an engraving AC. Use some needle like (conducting) object and connect this pin to metal cover (ground) - this will reset your watch.
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The 395 is a lower power output but same voltage (1.5v). The power spike of shorting might have caused a spike in the watch electronics.. make sure they are right polarity too. These batteries are not high current items, but maintain their voltage over the 5+ year lifespan. The S and SW are basically interchangable except for the higher amerage output.
Shortcut battery with AC contact. AC can be found on the sides of watch movement(very tiny). You have to use pointed tweezers: one end on battery+, another on AC contact for three secs. this video is only an example as to what to do hope this helps you.. http://www.youtube.com/watch?v=ogCz2vjUKVg
mcdevito75 here, Of couse without the watch and piece of metal that fell out it"s very hard to say. Most likely it was part of the lock-down tab to keep the battery in place, in any event don"t lose that piece of metal. If your casio is working ok don"t worry about it, just don"t lose that piece of metal that fell out.
I had a similar problem with my Casio watch when I changed the battery. I put it to one side and used another one and eventually it re-set itself (it took some days I think, although I wasn't watching it too closely.
You have to open your watch caseback. Undo the battery holding contact, get the battery out and memorise the writings on the battery. Buy exactly the same one and replace it in the backwards way you took it out. Do not forget to rate, please.
This reset trick works with other Casio Alarm Chrono digital watches,
such as my old Model W-720, similar to your F91-W. After the new lithium coil cell is
installed and secured with the spring clip, the watch may show random
segments in the LCD display or may simply be blank. Insert a sewing
needle, paper clip, or blade of a small jeweler's screwdriver into the
hole on the back of the movement stamped "AC" (All Clear) to
momentarily connect the gold plated contact at the bottom of the hole
to the stainless steel battery clip. The battery clip in most such
Casio watches is connected to the "+" terminal of the coin cell. This
will reset the CMOS chip and it should start up with the watch
displaying 12:00 and the date at 1-1. Then, use the control buttons to
set the time and date in the normal fashion.