How to Change a Watch Battery

When your watch stops keeping correct time, there is something obviously wrong. First, ensure that your watch is NOT a automatic watch, since an automatic watch never need a battery. Before throwing it away, try to change the battery. Most of the time, when a battery starts going bad, it causes the time to run slow. After that, the watch stops running altogether.
Steps
1. Turn the watch over,Place a soft pad under the crystal of the watch. A towel or dish cloth will work to prevent scratching the crystal of the watch.
2. Remove the back cover. On some watches, the cover will pry off using a very small flat-bladed screwdriver or will have screws holding the cover on. On more other brands the entire cover will unscrew. Examine the edge of the back cover. If there is one small depression along the edge of the cover then the cover will pry off. If there are screws present, the cover will lift off after the screws are removed. If the cover has a raised edge with flat edges opposite to one another then the cover will unscrew.
3. Carefully remove the gasket. Almost all watches will have a rubber-like gasket around the edge of the back cover. Carefully remove the gasket and set it aside for re-assembly.
4. Locate the battery. The battery will be a round, shiny, metal pill-shaped object. It will vary in size but will most likely be less then 3/8 inch ( 9.5mm ) and larger then 1/4 inch in diameter ( 6mm ). It will be held into the case with either a cover and screw or a clip.
5. Remove the battery. If the battery is held with a cover and screw, remove the screw using a very small screwdriver. The head may be philips or slotted. Carefully set the screw and cover aside. Remove the battery and set it aside for identification. If the battery is held with a spring clip, pry the battery from under the clip with a small flat-bladed screwdriver. Note very carefully which side of the battery is facing outward and which side of the battery is facing into the watch case prior to removal.
6. Identify the battery. watch batteries are identified with numbers located on the back of the battery. The numbers are generally 3 or 4 digits such as 323 or 2037. Notice that one side of the battery is marked with a large plus sign. This is the positive s de.
7. Purchase the replacement battery. watch batteries may be purchased in the US in drug stores, discount stores, electronics stores and jewelery stores. The number of the battery ( not the watch model ) is required to purchase the battery. Bring the old battery.
8. Install the new battery. Remove the battery from its protective wrapper and wipe the battery to remove any film or fingerprints. Place the battery into the watch body in exactly the same position with the same side down as the old battery. Put the battery into the clip if a clip is provided or replace the cover and screw if they are used to hold the battery.
9. Check for operation. Turn the watch over and check to see that the second hand is advancing or that the seconds digital display is advancing depending on the type of watch.
10. Replace the gasket. Place the gasket onto the cover or into a groove provided for it in the case. Be very careful that the gasket is fully into the groove or around the cover evenly so that no part of the gasket will be pinched when the cover is installed on the watch body.
11. Replace the cover. Be careful not to damage the gasket. The gasket may be impossible to replace if damaged. (Note: this probably will require a special vice that you can either purchase yourself or (more likely) pay a watch shop or jeweler to use for you. There will usually be a small fee--around $10.)
12. Recheck operation of the watch.

Tips
· Be careful with screwdrivers. The watch case and crystal can be easily damaged by lack of caution when prying or removing screws with small screwdrivers.
· Be careful with the crystal. Pressing down on the caseback without cushioning the crystal may result in scratches or breaking the crystal
· Check carefully the cost of watch versus the cost of the battery. Some inexpensive watches will cost less than the price of the battery.
· Use a magnifier and adequate lighting to prevent small part loss.
· Use a black piece of construction paper to hold small parts. The contrast makes the parts easier to see.
· If you're still worried or uncertain about opening the case of your watch, consider taking it to either a jeweler or the watch/jewelry section of a department store. You can often have the work done cheaply or at no additional fee (other than buying the battery)

Warnings
· Small screwdrivers can cause deep puncture wounds if not used with caution. Do not work on a watch while holding it in a hand. Parts loss and injury can occur
· If you damage the watch trying to remove the battery, you may void the manufacturer's guarantee, and they will not pay to get it fixed again.
· Any battery brand can be used however the warranty is voided if you install the wrong battery model number.
· To avoid the risk of short circuiting the watch with static electricity use plastic or non-metallic tweezers to hold the battery and consider wearing an earthing strap or rubber gloves.

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