Fossil Explorer watch BQ9381.
This watch is relatively simple to work on, though you have a total of nine (9) screws, three (3) batteries of two different types, a spring-pin in the wristband, and an o-ring seal to contend with. Nonetheless, you should be able to do this in half an hour with the following tools: Fine tweezers, preferably curved tip; these tweezers should be able to draw blood if you poke yourself lightly with them. Miniature (jewlery) screwdriver set, with tips no wider than the thickness of a dime. Clean toothbrush. Mouse pad for a work surface (optional but highly recommended). READ ALL OF THESE INSTRUCTIONS BEFORE DOING ANYTHING. If you feel you are not up to the task, take it to a jeweler or reputable watch retailer (NOT WALMART!!!)1. Disconnect the 12 o'clock half of the wristband from the clasp. Remove the pin, and re-install it into the clasp so you don't lose it, or simply set it aside if you're afraid of it launching.2. Remove the four Philips-head screws from the caseback. Lift off the caseback and check the o-ring seal. If it starts to come off, remove it and set it aside.
3. There are three batteries in this watch: two (2) 392 silver oxides (they may also say 41, 192, or 384) run the analog movement and are held in place by two (2) Philips-head screws each, and one (1) 364 (it probably says 621) silver oxide running the digital circuit. It is best to replace all three at once to get the maximum life out of each battery per change to minimize damage to the seal by unnecessarily opening the watch several times.
4. Using a pair of tweezers, carefully remove the self-adhesive insulators that cover the two larger 392 batteries; set them aside adhesive side up where they won't get in the way. Then remove the two Philips-head screws from each battery clip. After removing the first one, the second will likely get "stuck" in the clip as the contact pushes it upward at an angle, engaging it with the threads. Don't worry about that, but do be careful not to lose either the screw or the clip. Repeat for the second 392 battery.
5. Remove the one slotted-head screw from the 364 battery clip. You may need tweezers to remove the screw, clip, and battery from the battery recess. DO NOT TRY TO DROP OR SHAKE THESE OUT.
6. At this time, you may want to clean the perimeter of the watch opening where the o-ring seal will be replaced. Use a toothbrush and try to scrub away any dirt. Don't brush across the open PCB of the watch as you will get dirt inside it that way. Gently work your way around the outside.
7. Installation is reverse of removal. Remember, there is ONE of the smaller 364 batteries down in the recess, and there are TWO of the larger batteries on top.
8. When you have ensured that all five battery screws have been properly replaced, and the self adhesive plastic insulators have been positioned properly and are sticking to the clips on the 392 batteries clips, hold the o-ring seal between your fingers only tight enough that you can pull it through your fingertips with little effort. Wipe the entire o-ring seal in this manner for several rotations.
9. Gently stretch the o-ring around the perimeter of the opening. Use tweezers to position it, then hold it down on one edge and work the tweezers between the inside of the o-ring seal and the outside perimeter of the opening so that it guides it into place. It may try to "roll" out of position; keep running the tweezers around the perimeter until the "roll" works itself out and the o-ring seal stays seated nicely in position on its own.
10. Replace the caseback, ensuring that the orientation is correct: the top of the text will be in the 12 o'clock position, which is where the band that was disconnected from the clasp is. The crown knob will be facing left with the watch face-down while the text is legible.
11. Re-connect the band to the clasp. Insert the pin into the end of the band, then insert one end of the pin into the clasp. Angle the other end in and if your band hasn't twisted around too much, you may need to use your tweezers to compress the pin into place. Rotate the pin and band until both ends find their hole.
12. I did mine in about 15 minutes, and no additional work was needed to "restart" the watch although the time needed to be set, obviously. Your results may vary. The digital portion was not dead when I replaced its battery. I am not responsible for lost or damaged watch components. I'm just a guy on the internet.
on Jan 11, 2017