HOW DO I CHANGE THE BATTERY ON MY TIMEX 40691

We aren't Timex, we are Fixya. Contact them direct. Make sure you are using the right compound of battery, not just the right size.

https://www.google.com/search?q=Timex+Expedition+watch+that+keeps+losing+time

https://www.fixya.com/support/r27181038-changing_watch_batteries

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After changing the battery press and hold all the buttons at the same time to reset this will make the watch and battery works properly so that the battery wont drain easily. I hope I have been helped you.

If you don't have the proper tools I recommend that you not do this yourself. You could scratch the case or damage the movement if you don't know what you're doing. If it's a water resistant watch the gasket also needs to be replaced once it is opened. DO NOT reuse a gasket! For about $8 any watch or jewelry store can change the battery and renew the gasket for you.

If you haven't got any instructions you can get a copy from their web site.

If you have instructions and they are of not help, I suggest that you contact Timex and tell them of your problem.

You can get instructions from the Timex web site "timex.com".

At the bottom of the screen click on "manuals/downloads", then on "product
manual download"

Enter your watch type in the search box and click on "search"

http://www.timex.com/info/Product_Instruction_Guides_Downloads

Use the numbers on the back of your watch and you will have a PDF version of your instruction manual.

Hope this tip helps
R/
David

I found and pressed the reset button with a tiny screw driver. After about 10 attempts, I pressed the function side button and found that date and time displayed temporarily while holding button down.

Finally after more reset attempts, the time did display.

The nice thing about Timex is they have a 12 month warranty that covers just about everything. If you have had the watch longer....
Get the batteries checked. Battery life is typically about 2 years.
If the battery is fine then you can try having the watch reset but in most cases the LCD board or circuit board is damaged the watch has to be replaced to have it function correctly.

Remove the four screws that hold the battery cover on the back of the watch. Remove the 3 very small screws that hold the battery in place. Remove the battery from the battery holder. The piece that the 3 small screws were removed from seperates from the 3 volt 2016 energizer battery. Replace the battery with a new one. Re-install the battery holder to the watch. There is a small tab on the lower left part of the battery holder that needs to be depressed to activate the watch. Depress it and look at the face of the watch to make sure it is activated. The watch will need to have the time, date etc reset but you should now be able to see that the battery is working. Replace the battery cover and reset the time and date as needed.

old battery perhaps?

Here's the inside of my Timex Expedition Dive watch. To reset the watch after replacing the battery, press down with a small screw driver on the metal tab that the red arrow is pointing to.