I need screws for the back cover and the screw for the battery cover, Can you supply the screws and what's the price and how do I order them - for a timex expedition

Most watches have one of three types of rear cover. Push On, Screw On and Screw Down. The easiest way to tell is to look closely at the actual back cover. The batteries in some watches are held down with a spring loaded cover you unclip to access the
battery.
A totally smooth back cover suggests a Push On type. On the edge there should be a groove or a notch. Use a thin edged tool to lever off the cover with a firm but gently action. Once you have replaced the battery the cover should push on and click once in place.
If it has regular notches or dimples around the edge of the cover the whole cover will need to be unscrewed, the 'Screw On' type. The whole cover needs to turn like a bolt head. This often needs a specialist tool to do it.
The last type is a rear plate held down with four tiny screws. This is normally most common on 'Sport' watches.

Yours is most likely a 'Clip On' type which you lever off.
Most watches use one of three methods to access the battery. 'Clip on' back cover, 'Twist Off' back plate and a 'Screw Down' back cover.
'Clip On' back covers are usually smooth ands round with no notches or holes. They are levered off using a blade style lever. Some watches even have small grooves or a small lip sticking out to lever against. Most common watches tend to use this style.
'Twist Off' covers usually have evenly spaced notches or round dimples around the edge of the cover to mount a special tool to unscrew the entire cover plate like a bolt head. Some higher priced watches use this system.
'Screw Down' cover are the easiest to spot. They are usually more square in shape and held down by four tiny screws, one in each corner. They appear most often on 'Sport' watches.

Your watch is a solar powered watch and normally you don't need battery change .Nevertheless,if (as it is an old Casio model),you are convinced that battery is the cause of your problems,then replace.
1) You have to be absolutely sure that you are able to carry out the procedure.
2) IMPORTANT!! Pse note that the specific battery IS NOT an ordinary battery as it is rechargeable.DO NOT TRY TO REPLACE WITH AN ORDINARY ONE.RISK OF EXPLOSION on your wrist.+total damage of the watch.New battery has to be exactly the same with the old one (ID.code).Can be ordered on E-Bay,I suppose.
3)TOOLS:Watchmakers screw drivers + philips small size screw driver (for backcover screws) + watchmaker tweezers + 2 finger rubber gloves.
Turn the watch upside down and carefully remove the four screws (try not to loose them).Remove the strap if needed.Gently remove the back cover.Pay attention as there must be 1 or 2 tiny springs embeded on the mechanism.Keep them in place and try not to loose them.You have to remove the plastic cover (pay extreme caution to the spring/s) in order to have access to the battery.Unlatch and remove (if needed) the battery holder ( if can be removed-remember the position to put it back correctly).Take out the battery and check for possible leaks.Check the battery compartment cleaness.DO NOT TOUCH WITH BARE FINGERTIPS THE CONTACTS OF THE BATTERY COMPARTMENT.DO NOT TOUCH THE NEW BATTERY ON BOTH SIDES WITH BARE FINGERTIPS.Use the finger gloves.Put the new battery in place (do not force) and secure back the battery lamina holder.There is a AC(All clear-reset) contact on the mechanism.Using the tweezers touch one end on this contact and the other to the metallic body of the mechanism.Lift the watch very carefully(as it is,upside down-without disturbing spring/s) and check if display is activated.By paying much caution put back the plastic cover correctly in position PAYING CAUTION TO THE SPRING/S. Clean up the back cover,gasket,and gasket furrow from dirt as good as possible.Check the gasket condition.Replace if needed.Apply a little amount of special gasket silicon compound all around the gasket,both sides.Put the gasket in place.Put back gently the back cover and screws in position.MAKE SURE TO POSITION THE BACK COVER CORRECTLY(in place and not upside down).Press it gently when in correct position before you screw.CHECK ALL AROUND FOR CORRECT CONTACT. DO NOT SCREW TOO TIGHT,DO NOT FORCE.Screw with fingertips until you meet resistance.
I hope this will help.
BRegards

The first answer is a canned answer. Seen it before. Examine the edge of the pocket watch. Start at the stem and look for a slight gap where the back cover meets the case. It is usually at the stem side or hinge side. Once located take a strong sharp knife and carefully pry up the back cover. It should remove fairly easily. I have about 12 pocket watches and they all work the same way. Once open there may be a small screw or two holding the battery in place. You will need a precision screw driver set or a small screw driver for glasses.

The back of your watch is attached in one of two ways. Look at the watch back. If it's smooth all around the circumference of the back, you have a snap-fit back. If, however, you see little notches cut into the edges--if they were extended, it would make the back look like a pizza that's been cut into slices--then you have a back that screws on and off. Pictures I've seen of your specific watch suggest to me that you have a snap-fit case back, though I'll include instructions about a screw-on back just in case I'm wrong.

A snap-fit case back often has a small (very small) raised section at one spot of the rim; this is so you can insert a tool called a case knife and pop the back off. If you don't see that small raised section, you'll need to wiggle the blade of your case knife under the edge and gently apply leverage from there--it's usually easiest by one of the watch lugs, as opposed to near the watch crown. If you don't have a case knife, you can often use a thin (but tough!) knife blade to do the same thing. Remember, though, that applying this much force through a knife blade can distort or take a chunk out of your edge, so be prepared to sacrifice a knife or be prepared to re-sharpen it after this exercise. A screwdriver does not work very well; the blades are typically too narrow to provide good leverage without distorting the case back, and they may even cutt a gouge into the watch body. Avoid using them for this purpose. To increase the water resistance of watches, modern snap-fit case backs are often very tightly fitted--they can be tough to get off, but they're even tougher to push back into position. I would not be surprised if you would need a jeweler's press to get the back of this watch back into position.

If, on the other hand, you have a case back with notches in it, you will need to unscrew the back of the watch. You'll need a special wrench to do this. There are lots of makers and models from a basic $5 "watch crab" to a $100 workbench-mounted device that works on all kinds of watches, including Rolexes. Again, because screw backs are usually tightly fastened to increase water resistance, simply using a pair of needle-nose pliers in the ridges probably won't work. Nor will using a screwdriver in one notch--these backs are designed to move when equal pressure is applied around the edges, and applying force in one area only locks things up. Under no circumstances try to pry off the back if you have a screw back -- this will damage the threads, and you'll probably never be able to get the watch back together again.

You can find case knives and case wrenches at many jewelry supply stores, mail order supply houses like Otto Frei (http://www.ottofrei.com/store/home.php?cat=296 will take you right to the watch repair tools), and on eBay. However, if you're near a Harbor Freight store, they sell a "watch battery changing kit" and jeweler's press for an extremely reasonable price. These aren't the ultra-high quality tools that a professional jeweler would use, but they'll be perfectly fine for changing the occasional battery for many years. I've probably closed 100+ watches using the inexpensive press I got from there.

The back of your watch is attached in one of two ways. Look at the watch back. If it's smooth all around the circumference of the back, you have a snap-fit back. If, however, you see little notches cut into the edges--if they were extended, it would make the back look like a pizza that's been cut into slices--then you have a back that screws on and off.

A snap-fit case back often has a small (very small) raised section at one spot of the rim; this is so you can insert a tool called a case knife and pop the back off. If you don't see that small raised section, you'll need to wiggle the blade of your case knife under the edge and gently apply leverage from there--it's usually easiest by one of the watch lugs, as opposed to near the watch crown. If you don't have a case knife, you can often use a thin (but tough!) knife blade to do the same thing. Remember, though, that applying this much force through a knife blade can distort or take a chunk out of your edge, so be prepared to sacrifice a knife or be prepared to re-sharpen it after this exercise. A screwdriver does not work very well; the blades are typically too narrow to provide good leverage without distorting the case back, and they may even cutt a gouge into the watch body. Avoid using them for this purpose. To increase the water resistance of watches, Relic case backs are often very tightly fitted--they're tough to get off, and even tougher to push back into position. I would not be surprised if you would need a jeweler's press to get the back of this watch back into position.

If, on the other hand, you have a case back with notches in it, you will need to unscrew the back of the watch. You'll need a special wrench to do this. There are lots of makers and models from a basic $5 "watch crab" to a $100 workbench-mounted device that works on all kinds of watches, including Rolexes. Again, because screw backs are usually tightly fastened to increase water resistance, simply using a pair of needle-nose pliers in the ridges probably won't work. Nor will using a screwdriver in one notch--these backs are designed to move when equal pressure is applied around the edges, and applying force in one area only locks things up. Under no circumstances try to pry off the back if you have a screw back -- this will damage the threads, and you'll probably never be able to get the watch back together again.

You can find case knives and case wrenches at many jewelry supply stores, mail order supply houses like Otto Frei (http://www.ottofrei.com/store/home.php?cat=296 will take you right to the watch repair tools), and on eBay. However, if you're near a Harbor Freight store, they sell a "watch battery changing kit" and jeweler's press for an extremely reasonable price. These aren't the ultra-high quality tools that a professional jeweler would use, but they'll be perfectly fine for changing the occasional battery for many years. I've probably closed 100+ watches using the inexpensive press I got from there.

Yes, the battery for this watch can be replaced. Timex estimates that the battery should last 2-3 years, but that assumes an "average" use of the Indiglo backlight. If you never use the backlight or audible alarms, your batteries would have lasted longer; heavy use of both would have run the battery down more quickly.
If you want to replace the watch battery yourself, you'll need a very fine philips or flathead screwdriver, the new battery, and a bit of patience. It would also be helpful to have a pair of tweezers, but that's not absolutely necessary. If you carefully look on the back of your watch, Timex usually lists the battery type so that you can buy a replacement battery without first opening the watch. If you can't figure out what the numbers mean, take it to a jewelry counter at Target or Walmart, and they should be able to help you decipher it. I don't know which battery this specific watch takes, but many Timex watches use a #1620 or #2016 3v battery. Look for a number like that on your watch back.
To open up the back of the watch, open the strap so that you have good access to the back. If you have a steel band, you might need to slip out one of the adjustment pins to separate the band into halves. Yes, you might be able to take the back off without this step, but it makes it a lot easier.
Place the watch face down onto a soft surface. I like to use a dark towel, so that if I drop one one of the tiny screws you'll be dealing with in a minute, they won't bounce and you can easily find them again.
Use your screwdriver to loose the back of the watch, one screw at a time. I find it very helpful to loosen a screw, then use the tweezers to pick it up out of the hole. These guys are tough to grab with your fingers! Put the screw in a safe place, then carefully remove the back of the watch. A little black neoprene gasket may be stuck to the back or be floating around--don't lose that!
You should be able to see where the battery is kept. On most Timex watches, there's a metal shield covering the watch and completing the power circuit. Using your screwdriver, gently pry the tabs of this shield away from the watch movement, one tab at a time. Try very hard not to snap off any of the little plastic anchors. On a Casio watch I recently serviced, I had to remove the movement from the watch to get at these little tabs; I don't remember ever having to do that with a Timex.
Once the shield is loose or removed, the battery should slide right out. Replace the battery, and gently snap down the metal shield. Turn the watch over to check whether it's working again. If it's not, you may have to push a little "reset" pin on the watch movement to clear the registries. The back of the metal shield usually has instructions on where that little pin is located. If the watch is already working, you won't need to do this.
Closing up the watch is the reverse of what you did to get it open. Make sure the neoprene gasket is back in place--that's what's keeping sweat and water out of the watch--and carefully set the cover back in place. Tighten the screws in an "X" pattern--i.e., top left, then bottom right, then bottom left, then top right. I get all the screws loosely screwed in before tightening them down in earnest. This watch has a plastic case, so you want to tighten the screws snugly, but not over-tighten them so that they strip out the screw hole.

Spread the towel out on a flat surface.

Remove the watchband if necessary in order to access the back of the watch.

Unscrew the back protector from the watch using the correct size miniature screw driver. Place the screws in a small pile on the towel. Be careful not to drop them as they are difficult to find.

Remove the back plate by unscrewing the small screws. There is a tiny spring on the underneath of the back plate. It may be visible, or not. Make sure not to turn the watch upside down or the spring will dislodge.

Remove the rubber protector to find the battery.

Use sharp point tweezers to remove the clasp covering the battery. There is a small hole at one end of the clasp. Insert one end of the tweezers into the hole to spring the clasp loose.

Remove the old battery with tweezers.

Insert New Battery and Reassemble Watch

Pick up the new battery using regular tweezers and put it into place. Do not touch the battery with your fingers.

Replace the clasp over the top of the new battery.

Perform a reset by touching the AC contact with one part of the tweezers and the back of the battery with the other part. Hold for a few seconds. Lift the watch carefully and look up at the front to make sure the watch is working. Do not turn the watch over.

Replace the rubber cover.

Replace the back plate by screwing the small screws back into place.

Replace the back protector by screwing the small screws back into place.

Reattach the watch band to the watch face.

Feel a bit unnerved by this? Find a local jeweler. Best regards.
Jewel

mcdevito75 here, Those 4 screws hold the back onto your Timex. Do not try to pry off the back cover, rather you"ll need jewlers screwdrivers to un--screw that back cover to replace the battery.

You know where AC pads are right? If you don't know, look at the sticker. there is an arrow on the sticker. An arrow points out 11'oclock.
After insert the bettery, you just touch the golden pads with metal screw. that is how to short AC pads.