How do you put the back back on because I had to change the battery

Open the back of the watch, take the battery out, put a new one in, put the back of the watch back on.
Or take it to a local jeweler, ask what they charge and how long to do it. It's usually $5 to $10 depending on the price of the battery.

The jeweler should be able to put the back on again. He/She has the tools.

do you see there is a whole in the middle of the metal cap? try using your tweezers to create a lever and put just enough force that it pops open. You can also remove the whole thing out so it is easier to work with. Good luck!

The back does not come off (case is in one piece); it's the bezel -- the metal rim that holds the front glass crystal.

There is a small notch in the rim of the bezel (on mine, this aligned with the 'lower left' lug on the case around 7:00 on the face). Be careful as there is an O-ring to waterproof the watch, and this notch goes right into the groove where that O-ring is located. Use a case knife or similar stiff but fairly thin-edge blade to pop the bezel off (it snaps off). Then gently remove the outer plastic ring, noting carefully how the notches are aligned.

The inner module now can be lifted carefully out - the two 'pushers' will not fall out of the case when you do this. The battery is a 3V lithium CR2025, and you will need a fairly small straight-blade jeweler's or optician's style screwdriver to remove the one screw that holds down the battery bracket - it may be tempting to bend this out of the way to change the battery, but please resist that temptation...

Put the module back in the base, put the ring back over the dial plate, and carefully snap the bezel back in place with its notch aligned as you found it. You might want to check and/or lubricate the O-ring as you do this.

Instructions for initializing the movement are printed inside the case: they list the switch for the 'recessed' button as A, and the pusher as B. In case you didn't note them before closing the case: to reset:

1) push A once. (Display will read "SET"
2) Push A until hands are exactly on 12:00 (and display reads "12"
3) Push B once to start reception

You then follow the standard procedure of putting the watch in a window facing Fort Collins, Colorado, until it picks up the time signal and synchronizes itself.

If you need more assistance with the physical module, there is contact information on it from its manufacturer:

[email protected]

Model number on my module is AR600 WWVB (37.5mm)

Yep, here it is....SR920W

Unscrew or pry off the case back. Remove the metal strap holding the battery in place. Sometimes you have to remove screw in the metal strap. Look on the battery for the type and order by that number. Put back in with fingers or plastic tweezers. Do not use metal tweezers as it will short the battery.

You can remove it with a pocket knife and it will pop out but the problem will be putting it back and that is only done with pressure that is put under a machine.If you go to a flea mkt they will do it for $5-7.00 for the battery and the cover pressure is free once the battery is changed.So make sure you get a good long time warranty battery so you dont have to change the battery frequently.

The battery is CTL 1616 and I had the same occurance when I opened up my model Casio model 3043. I needed to use the battery to test my model 2767 and find out if a new battery would bring it back to life (yes, it still lives). After replacing the battey back into my 3043, I jumped the (ac) to (-) and at first the watch would indicate all was well but then it would revert back to "open". I tried over and over to try and get the "open" display to clear but I was not successful. I then thought to go ahead and replace the back on the case to see if the three contact springs would change the display and sure enough, "open" no longer was in the display. The watch works perfectly as before. As for the 2767, as soon as I jumped the (ac) to (-) the "open" display went away. There is only one spring contact to the back case on the 2767 model. Unfortunately I do have an extra spring that fell out when I opened it up and I have no clue as to where it goes. I have not found anyone who can help me on the location for the shorter spring. Any advice would be most helpful.

hi
please follow the steps to change the battery

1. Step 1 Make sure the little arrow on the back is aimed to the right. Then, insert a small flat head screwdriver into the notch on the edge, and lever the back open. Place the back to one side.
   
2. Step 2 Unscrew the clip holding the battery (if your model has a clip), and remove the battery.
   
3. Step 3 Use plastic tweezers to put in a new battery. Do not directly touch the new battery. Screw the clip (if it has one) back on.
   
4. Step 4 Replace the gasket that seals the watch. Then lightly coat the gasket with a silicone-based grease.
   
5. Step 5 Align the back with the little arrow aimed to the right again, then carefully press the watch between two pieces of wood that are being held by a small vise, until the back seats itself.
   

thank you....

to change the battery of fossil blue watch,just open the case back and remove the old battery,look the number size on the battery and put a new battery that same number size ,after replacing battery press the case back tight to avoid water damage !good luck