Ae 91w My Casio AE-91W has started to gobble up batteries. When I install a new battery, everything works fine for a few minutes, but then it just dies, battery completely drained. What can be the problem?

Question edited for a little more clarity.

This is one of those watched with multiple dials and dozens of functions. It sounds like there is an hourly repeating alarm at 10 minutes to the hour. All time zones are synchronised to the top of the hour. The best thing to do is remove the batteries for 2 minutes and replace them. Then set the time again.

https://www.google.com/search?q=Casio+AE-1200whb-3bvdf+watch+manual

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Deron, Check the attached links,manual,instruction and guides, Good luck .
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Casio 91W User Guide Quick guide to set the time and use all the functions
How do you turn off hourly beep on casio 91w
Casio F91W Module No 593 Watch

You need to Shortcut the battery with AC contact. AC can be found on the sides of watch movement(very tiny). You have to use pointed tweezers: one end on battery+, another on AC contact for three secs to get the watch started

Hi,you need to look at the user manual..
just in case ,if you need soft version of the user manual pls visit the URL below..

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CASIO Watch User Manual Archives

http://world.casio.com/wat/download/en/manual/
Use this page to download a copy of CASIO watch manuals in PDF format.
To download a PDF file, enter the four-digit (or three-digit) module number marked on the back cover of your watch.

I've never used one of these watches, but after looking online, I think this is how it's done:

Try using the top-left button to cycle through the settings, and use the button on the right to change them. So I'd imagine that after pressing the top-left button enough times, the indicator for the hourly beep will start to blink. At that point, press the rightmost button.

The indicator on the face of the watch should light up to indicate that the hourly chime is enabled.

ho do i set my f-91w

Hi,here is the user manual..
soft version of the user manual pls visit the URL below..

Hope this helps! Take care and please Remember to rate/vote and give me
4 Thumbs Up for me to continue for Helping out the Community :)
Thanks
***************************
CASIO Watch User Manual Archives

http://world.casio.com/wat/download/en/manual/
Use this page to download a copy of CASIO watch manuals in PDF format.
To download a PDF file, enter the four-digit (or three-digit) module number marked on the back cover of your watch.

Push the lower left button. The alarm time is showing.
Press the lower right button and it will cycle the hourly beep and alarm on/off.
Press the lower left button to exit when the setting are what you want.

Most of these resin-case F-series Casio sport watches use a fairly large lithium coin cell battery. Once the four screws holding the watch back are removed, you should be able to just pop off the stainless steel spring clip that holds the cell in place and pull it out, without having to remove any more screws. Be careful when replacing the clip, because it is asymmetrical and goes in only one way. Also be careful not to lose the tiny spring contact that connects the watch movement to the piezoelectric sound element glued to the watch back. If you lose the spring, the watch will still run, but the alarm won't sound anymore.

This reset trick works with other Casio Alarm Chrono digital watches, such as my old Model W-720, similar to your F91-W. After the new lithium coil cell is installed and secured with the spring clip, the watch may show random segments in the LCD display or may simply be blank. Insert a sewing needle, paper clip, or blade of a small jeweler's screwdriver into the hole on the back of the movement stamped "AC" (All Clear) to momentarily connect the gold plated contact at the bottom of the hole to the stainless steel battery clip. The battery clip in most such Casio watches is connected to the "+" terminal of the coin cell. This will reset the CMOS chip and it should start up with the watch displaying 12:00 and the date at 1-1. Then, use the control buttons to set the time and date in the normal fashion.