Which battery what battery does this model take, as it is to small to read on the back of the case.

1. The "AC "or "All Clear Circuit" button if the watch has one will be found on the back of the movement. It will usually be a small silver or gold dot marked "AC" or reset. In some cases it will be a small hole or plunger you depress with a pin punch.
2. Clear watch memory. Look for and find the small gold or silver dot on the back of the Seiko watches movement. It will be marked "AC" if it exists. Use the metal tweezers and touch the "AC" button with one prong and the battery with the other. In some cases you just push in the plunger on the "AC" button. In the case of a plunger or hole press it with a pin punch.

Use a knife to lift the case back off, there will be a spot to get the blade under it. Take care not to scratch the case or back. Once inside you will see the watch movement including the battery, you will need to use some pointy tweezers to carefully move the small arm which holds the battery in place, be very careful and gentle. Replace with correct battery, using your tweezers so the acid from your skin doesn't start any corrosion later on. You will have to hold the small arm back to get the battery back in, it should go in easily so don't force it. Line up the back of the watch so the small cut out is on the same side as the stem and crown (winder) Push the case back down applying even pressure taking care not to push against the glass on the other side. Make sure it is making contact all the way around. Set the time and you are done. If in doubt take to your local jewellers or watch maker, as it is only a cheap thing to have done professionally. Good luck

The battery is actually accessed from the front of the watch.
You should have a "Case Knife" to remove the front bezel.
Remove the band first.
Set the watch in its side. Set the case knife at the groove where the watch band holder meets the front bezel, and give the back of the knife a sharp rap with a small hammer. The front bezel should pop off.
Some watches have a small circular plastic piece that will also come out. Gently remove the movement from the front. The battery (CR 2025) can then be removed from the back of the movement using a small, thin blade. Install the new battery. The inside back of the case should have restart instructions. (Push A -left button once. then push and hold A until hands move to 12:00. Push B once to start reception.
The back of the watch is plastic. Don't try to remove it.
Gently re-assemble movemengt. A watch case press tool is best for finishing assembly. I would suggest taking the watch to a jeweler if you are uncomfortable taking this watch apart. Good luck

To open the back of a Fossil Am-4065 your best bet is to use a watch case opener like this



You can also use a pair of needle nose pliers, but you then run the risk of damaging your case back. I would advise against it. I've had to deal with quite a few watches that were damaged in such a way.

The opener has an assortment of small pins. Usually you will be able to find some that will best correspond to the size of the grooves on your watch. Then the case opener can be adjusted so that the pins are securely fitted to the grooves so that you can then turn the case back off.



You will need to hold your watch securely while turning the opener, or it may slip out of the grooves and damage your case back. This is not a difficult task, you just have to go slow and carefully.

After you do so you should be able to carefully pop the battery out. Do not use a small screwdriver or other metal tool to do so. It can damage your watch. You can usually use your fingernail. After you do so you can simply read the battery number off and find a replacement. Many grocery store/drug stores and Radio Shack carry an assortment of watch batteries. You can also go to a website like Battery Bob and order the battery, but for one battery it may not be worth it.

Your watch will not have the same water resistance after you open it. Usually a watch like this will at least have it's case gasket lightly wiped with silicone grease before it's re-closed (or have the gasket/O-ring replaced and treated with grease). This should not be a problem if you don't swim or bathe with your watch on.

There is a 437 stamped into the back of the case for one of the two versions (437 and 438) of Casio WR watches, with the 437 being the kind with raised rubbery number buttons. The model no. for the 437, also on the back case is CA-53W, useful for ordering parts (see below). These instructions are for the 437 but should be useful in many cases for other Casio watches, with numbers other than 437 or 438 on the back of the case. For example, the resetting process described in step 5 below appears to be common to many if not all Casio watches. There is no manual on the casio.com website for many watches, including the 437 and 438. There are no instructions for changing the watch battery in the manual for the 437 or 438 either, nor for many if not all Casio watches. If there is a 438 stamped on the back of the case, the chip is the same as on the 437. The buttons on the face of the 438 watch are flat plastic rather than raised and rubbery. The two buttons near the top serve the same function on the 438 watch as the right side buttons on the 437. The left top button on the 438 corresponds to the top right side of case nonindented button on the 437. The right top button on the 438 corresponds to the bottom right side of case lower indented button on the 437. Save time and money by replacing the battery yourself If you send your Casio watch off to have the battery replaced, it will likely cost you about $30 USD. Many jewelers will routinely send a Casio watch off for battery replacement rather than replace the battery themselves, so these instructions may help save you from delays and expense if you do it yourself. Likewise, jewelers may find these instructions useful for satisfying customers by replacing the battery on the spot rather than having to send the watch off to Casio. Materials needed a. 5/64" Phillips head screwdriver (A set of different size screwdrivers in a small black plastic case, including the 5/64" was bought for $1 USD at a local Dollar Tree store in the USA.) b. Watch battery identically numbered to the dead battery on the watch (2016 on 437 case back number) c. Metal tweezers to reset the watch d. Sil glyde gel grease or any other grease, to maintain water resistance f. Toothpick or similar to spread grease in O ring slot g. Ziplock plastic bag or bowl to hold the 4 small screws so they don't get lost Instructions on replacing the battery and resetting the watch 1. Take off 4 back screws, using the 5/64" Phillips head screwdriver. One screw was balky and needed to have the screwdriver handle attached to a vise grip pliars, with the watch held in the other hand and rotated. Putting the screwdriver handle in a vise would also work to stabilize the screwdriver, while turning the watch held in one hand. Set the 4 small screws aside in a ziplock bag or bowl. 2. Remove the red cellophane cover on the battery, held by two tabs cut into the cellophane fitting into a slot on the metal hold down battery strap atop the battery. 3. With a fingernail or toothpick (nothing metal), slide the battery to the side, out from under the metal hold down strap atop the battery. 4. Insert new battery with fingers/fingernails, sliding it into place from the side. The side, with the battery number showing (2016 on 437 case back number) faces outward, just as on the removed battery before it came out. The watch will continue to appear dead, with nothing showing on the display until the electronics are reset in step 5. 5. Reset the electronics by using a pair of metal tweezers to simultaneously touch with metal, the outward facing side of the battery, and the brass terminal in an indentation in the plastic about 4 o'clock and about 1/8" outside the battery diameter. To aid in orientation, there is a barely visible small AC (presumably meaning "all clear") pressed into the metal near the battery and the indented brass terminal at about 4 o'clock. It may be necessary to tilt the watch in the light so the light strikes the AC so it becomes visible. Verify the display is working. Resetting the time will be in step 11. 6. Reinsert the red cellophane cover removed in step 2. It may be necessary to slide a knife or similar between the strap holding the battery down, and the battery, to make room for the two cellophane tabs to be inserted in a small air space between the strap and the battery. (When installed, the cellophane tabs do not prevent current from flowing between the top of the battery and the battery hold down strap.) If you use a knife or other metallic object to open up the strap to battery space to allow entrance of the cellophane tabs, take care not to short the battery against metal parts of the watch other than the hold down strap. Quickly glance to see make sure the display is still working after the cellophane is back in place. If display not working, repeat steps 2, 5 and 6 (remove cellophane, reset watch, reinstall cellophane). 7. Remove the rectangular O ring from the case back removed in step 1, or the case, and coat it with Sil Glyde silicone gel grease or similar, to retain water resistance. White grease or any grease should also work. Set the coated O ring on the inside of the metal case back removed in step 1. The O ring will eventually mate back with the O ring slot in the plastic case. 8. Using a toothpick or similar, coat the rectangular O ring slot in the plastic case with the same grease used to coat the O ring in the metal case back, to provide extra water resistance. Grease is nonconductive, so there should be no damage from shorting if some of the grease gets inside the watch. 9. Wipe hands clean and wash hands and/or use plastic gloves to avoid putting too much grease on the outside of the watch. 10. Replace case back removed in step 1. Screw in the 4 removed screws with your 5/64" Phillips head screwdriver.

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)

It can be the battery if your watch model has separate battery for alarm function. If your watch originally is running on one battery, then check out if the sound transmitter spring is missing. Sound is transmitted through the coil spring or small peace of metal which is sticking upwards out of movement, so, when the case back is fitted to the case, the spring is touching sound membrane inside the case back, thus enabling transmit vibrations (sound). If there is nothing as I just described, you will need to get one and fit it to the movement. If there is such a spring, then movement has micro electric fault and should be fixed. In both cases you have to visit your nearest watchmaker and ask for help.
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I found a "battery" website that had some suggestions that should be typical of any snap back case watch.
http://www.online-batteries.co.uk/whichb...

specifically they said that when you try to press the back on it must be flat (not one edge down as I had been trying) Put the watch face down on a non scratch surface and press with both thumbs evenly. If that doesn't work a press will be needed. If you have a vice a couple of blocks of wood to distribute the load on the front and back may work, otherwise take it to a jeweler with the proper equipment.

The thumb routine didn't work for me. I have a vice but figured many wouldn't so I tried something else first. I put the watch face down on a piece of wood. I found a small 2" long scrap of wood (3/4" x 1.5" approx) that spanned the back. I centered the back (aligned properly) placed the block of wood squarely and centered across the back and tapped the end of the block with a hammer. First try didn't work, second one did. I used a rubber mallet as the hammer but a regular hammer or other heavy object would work. The trick, I think, is to get everything lined up and square so the blow is centered and even.

Also, I'd suggest cleaning the back and the groove in the case and be sure the rubber gasket is properly positioned. This will give you the best chance of retaining the waterproofing. And remember to check that the watch is running before you do this. Some need to be reset (usually with a very small screwdriver or pin) after replacing the battery. There should be a small hole with some printing next to it. You may need a magnifying glass to see/read it.

Hope this may help you;

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The silver spring goes in a very small hole in the plastic casing on the bottom side of the watch located next to the wristband under the sensor. Hope this helps