How do u change a 377 battery in a fy1165 135 100ft waterproof watch

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not being inside your watch to see if water leaks in...it's hard to tell.  However, if you carefully replaced the battery and didn't damage the case or the gasket o ring, things should be fine.  Test it under the kitchen faucet first. 

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I was shopping for one in Thailand and it was a GE 371. I did not replace it because they only carried the cheap china battery's.

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That depends on where you are and on if a professional watchmaker is doing it (so the job is done right) or if you are taking it to a watch breaker at the mall or local jeweler.

A watchmaker will not only change the battery but will make sure the watch is resealed again which could require new gaskets. A watch breaker doesn't care about such things and will charge almost nothing but your watch will not be guaranteed to be water resistant from one of those people.

Water resistance is important. Everyone perspires and that moisture will get inside a watch if it is not sealed. It may not seem like a lot of moisture to you but honestly, the parts inside a watch cannot stand moisture. They corrode and rust within a few days even with the smallest amount of moisture. Once rust starts it cannot be stopped by drying the watch out. The parts with rust damage normally have to be replaced.

Now on a $10 watch no one will care about water resistance or for that matter replacing the battery most times. But on an expensive watch such as yours this is important because having to replace the parts of the movement is expensive and so you can expect to pay more for a professional battery change.

Hope this helps,

Ken
Yellowstone Watch, Inc
www.yellowstonewatch.com

SOURCE: Want to change 377 battery in Embassy Men's Watch

Casebacks can be attached in several ways. The most common is a snap-on type. The back will be smooth and if you look closely around the edge you should see a small slot somewhere along the edge where you can insert the edge of a caseback removal knife - it looks like a small oyster shucking knife - to pry the case open. The caseback me be very difficult to snap back on and require the use of a caseback plier or pressing tool. If the caseback is held in place by screws, you can carefully unscrew them using a good quality jeweler's screwdriver. the real cheap mini-divers will bend and scratch the watch. Another common method is a screwdown caseback. You will see indentaitions on the edge of the case back to recieve a caseback wrench to unscrew it. If your watch is water resistant, don't forget to replace the gasket as they are only good once. Most watch shops will replace the battery while you wait for about $8 so that may be your best bet.