Casio Watch F-91W Battery Change (Module 593)

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Casio Watch F-91W Battery Change 

(Module 593) 


Hello fellow Casio enthusiasts from around the World. I hope you are all well.


As the title suggests, I will be replacing the battery on my son's F-91W. He has had the watch from new and it is coming up to 6 years old. It's in excellent condition considering he has owned it since he was only 8 years old and worn it everyday since for school. The display is starting to fade, so it's high time I replaced the battery with a brand new one. The watch uses one CR2016 button cell, which cost me £3.50 (including delivery) for two cells and they are Duracell so a decent battery. I bought two as it's always handy to have new cells in hand if ever required. Now that batteries have been delivered, it's time to get started.


I know I should have removed the strap but it simply wouldn't budge from it's position and I didn't want to damage the watch as it is only plastic. I therefore left the strap attached to the watch and placed a heavy item at each end of the watch to keep it in position whilst I am working on it. With the watch pinned in position, I removed the 4 retaining back case screws. We can now see inside the watch as can be seen above. Again there is a plastic insulator stuck to the battery holder and doe's not need to be removed as you will discover.


With this particular watch, the whole module needs to be removed as can be seen in the above picture. I was very careful with the module and kept my fingers away from the display and the inner glass to avoid finger marks getting inside. 


The module needs to be removed to access the four clips that hold the battery cover in place, that are placed at the front of the module. The clips can be released using in very small watchmakers slot screw driver. The clip positions are arrowed in the picture above.


Another view of the clip positions.


After carefully releasing the four clips, the battery cover can now be removed as can the old battery. The battery cover also has the contacts attached to it for the button function, so I will be careful not to bend or distort the shape of the metal.


A close up picture of the watch module without the battery cover, showing the lower battery contacts and the alarm conductor pin on the left.


As you can see in the picture, I have the new battery (on the left) and the old Panasonic battery (on the right) ready to change them over. I then replaced the battery cover, clipped it gently into place and then inserted the module back into the case of the watch. 


Ensuring every component was refitted correctly, I replaced the watch back and screwed it down in the correct sequence until the screws were tight and job done.


As you can see, the display is now a lot sharper and darker as it should be. It's now good for operation for at least another 5 years. Happy days indeed. 

This watch is an entry level Casio and costs around £10 new in the UK. Therefore I would imagine, if you took this watch to a jeweller or Casio expert to have the battery changed, it's more than probable, it would cost more to have the battery changed rather than simply buying a new watch. However, in my case, this watch has a lot of sentimental value and I was capable of changing it. This may not be the case for some people, as they may not have the tools or experience to do so. In that situation, it would be the logical financially decision to replace the watch.

I hope you have enjoyed reading this post and hope it has helps you if you decide to change the battery of your Casio F-91W watch also.

Until my next post, Take care.

26/4/23

Casio Tribe 2023 


Hello, my name is Mr.B. I have started this blog as I have owned and loved (and still do) Casio watches for more than 40 years. I would like to explain the many reasons why I still own and wear a Casio Watch. I want to share details, upgrades and maybe a vintage Casio watch restoration post. I will also show you my humble, but very cherished Casio watch collection . I will also show my beloved and aged GW-M5600, I have owned and worn for the last 13 years. I will also be adding further watches to the collection and adding a detailed post for each and every watch. I also want to show you how to avoid a fake watch and what to look for when purchasing a Genuine Casio from any seller.

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