The back of my watch has never snaped cclose all the way allowing moisture in, I am also having problems with my battery life. my battery only lasts a few vweeks what could be causeing this and how can i fix it. I also would like to know what size battery i need, I lost the last one and cant remember the size.

Either a loose connection inside or it just needs a new battery. They can be power hungry depending on how you use it and what battery technology type was used in the last one.

How Long Do Timex Watches Last? (Watch & Battery Life)

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A Timex watch battery will last between two and five years, depending on how often you use the Indiglo feature, while the watch itself can easily last five to ...

it can be--their is no definite life span of a battery because everything has a different draw of power a simple watch can last years while more complex such as date/stop watch /backlight etc will draw and kill battery quicker

Sounds like when they replaced the battery they tore the rubber gasket between the watch and the back plate. This allowed moisture to get in the watch and cloud the lens. Take it to a watch repair shop and they can fix this for you.

Here is a complete teardown video from Youtube... it's a difficult project for sure!
https://www.youtube.com/watch?v=qcCB94volbA

If you do still have some battery life left, use some of these tips to reduce battery consumption...
1. Use cinema display mode when not in use (with current firmware installed, simply activate your screen and then press your button twice in a row). This will keep the screen off for a period until you deactivate this again (press once to activate screen, then press twice quickly again to deactivate cinema mode).
2. Dim your display. The screen is nice when it's bright, but this is a major reducer of your battery. Dim your display to what you need and watch your battery last.
3. Activate airplane mode. Also found in your settings, this will disconnect your bluetooth connection to your phone, but it will also extend your battery significantly.
4. Make sure "ambient screen" is turned off. This is also in your settings. Leaving it on will allow your screen to dim to a lower setting when inactive, rather than shutting off. It allows for a bit more eye candy when being worn, but does reduce battery.

Depending on what you are using the watch for it will have different battery life. Using the talk feature you should get around 2 hours, on standby about 7 days, the analog watch has a seperate battery that should last 2 years and charging the watch takes 2 hours to get a full charge.

On average, I've found that analog wristwatches that use a silver oxide (or alkaline) battery last about a year after a fresh battery has been installed. Digital watches, because they have no moving parts, will typically last longer on a set of batteries if you're not using the alarm or backlight function. Watches that use lithium batteries generally last two years or more between battery changes.

Based on your model watch, I would guess that your battery has run down too far to power the movement. A fresh battery will probably fix your watch. Hint: in the future, if you aren't going to wear your watch for a while, pull the stem out into the "set" position. That will stop the movement and extend the life of your battery. When you want to wear the watch, simply set the time (and date, if you have a date window) and push the stem back in.

I would try replacing the battery in your watch to see if it comes back to life. So-called "atomic watches" have tiny radio receivers in them that periodically listen for the official atomic time being broadcast via WWVB in Colorado. However, as you might imagine, it takes a lot more power to operate a radio receiver than it does to power a typical quartz wristwatch, and even with larger-capacity or double batteries, it's been my experience that these watches burn through batteries more quickly than traditional "set them yourself" watches.
An additional factor is that a watch that cannot find the WWVB signal will scan for long periods of time before putting its radio receiver into hibernate mode. So, if your watch has been stored in a basement, an interior room in a large building, or some other place where a radio signal can't penetrate, that would also shorten the watch's battery life.

It is hard to say how long a battery should last without knowing the details of the model.

If it is just a timepiece without any additional functions, then a battery should last at least one year and often will run for two or three.

If there are other functions e.g stop watch, back light, memory, alarm etc., then the life of the battery will depend upon the extent to which these functions are used. How long is a piece of string?

If you think that the battery failing, then take it back to the supplier and ask for a replacement, (if you have the receipt).

You HAVE to bring your watch to watch repair shop as the moisture in watch can dissapear for an eye, but it will still there and can affect your watch to function properly.
Do not try to dry out watch yourself as the temperature changes can affect the watch as well.
Find your nearest watch repair shop as quick as you can because that moisture is shortening your watch life very quickly.
Don't forget to rate, please.