My bulova watch isn't working

They use many, so the answer is always "the same as the one that came out of it".

https://www.energizer.com/specialty-battery-finder/bulova-watch-battery-replacement

Nothing here, which is odd because that normally works,

https://www.google.com/search?q=Bulova+98H48+battery+type

Look for tiny engraving next to the battery compartment.

Or ask them direct.

https://www.bulova.com/ca/en/contact-us.html

..

https://www.quora.com/How-do-I-know-which-battery-I-need-to-fix-my-bulova-watch

I have changed batteries on watches before but none were bulova. I opened the back which you have to do to change battery find what battery you need and order online. I have been able to find at stores year ago but most watches now days people don't change batteries they buy new watches. It is a little harder to find batteries in stores.
When you find the type battery google to get the place to buy it.
https://www.energizer.com/specialty-battery-finder/bulova-watch-battery-replacement

Maybe "Bulova" have "Energy save mode" like my "Casio ProTrek"? Both models are quartz movement. When I don't wearing my watch he go sleep after 1 day and wake up when I pick up.

Most likely...
Bulova 228 = S05 American Watch institute, USA: 357 (303)
Japan: SR44W .. (SR44SW)

Possibly...
Bulova 606‎ = S32 AWI... Energizer/Duracell 377 or SR626SW


from:

Which battery number may use in this watch bulova 96t63 thanks


and

Specialty Battery Finder

cant see that model watch on the Bulova web site user manuals
http://www.manualslib.com/brand/bulova/watch.html
if unsure if it needs a battery go to a jeweler or watch or battery seller

some model Bulova Watched instructions
IF YOUR NEW WATCH IS A MECHANICAL WATCH
(no battery)
Mechanical watches differ from Quartz watches in several
respects:
1. No battery changes are needed - they are powered by a main-
spring, which is wound either by wrist movement; or in some
models by daily winding of the setting crown.
2. Because it is a mechanical device, it's accuracy is subject to
the effects of gravity and temperature. You can expect, on the
average, a daily variance of up to 10 to 20 seconds for
mechanical watches.
3. Just like automobiles, these watches require routine mainte-
nance. Due to their mechanical complexity, mechanical
watches require cleaning and new lubrication every 3 to 5
years to run at optimum efficiency.
FOR THE AUTOMATIC SELF-WINDING
MECHANICAL WATCH
it must be wound at least six or seven times before you wear it.
After that, your daily activity should wind the watch sufficiently
to keep it running at night when it is not being worn. If your
normal daily activity is not sufficient, occasional supplementary
manual winding may be necessary. It is suggested that your
mechanical watch be cleaned and oiled periodically to insure
optimum performance. As a mechanical watch, quartz watch
accuracy cannot be expected. References to the power cell do
not apply to Automatic watches

1. Take the watch off your wrist and turn the watch so that the back of the watch is facing up.

2. Use a watch case opener or a small flathead screwdriver to remove the back of the watch.

3. Carefully take out the old battery and discard it properly.

4. Insert the new battery, making sure the plus and minus signs line up with the corresponding symbols in the watch.

5. Securely close the back of the watch.

6. Put the watch back on your wrist and you're done.

To reset the watch, you need to 'short' the reset point with the battery. To do this, with the watch face down and the back removed the 'Reset' point is in the bottom right hand corner (a gold-coloured contact point). Use a pair of metal tweezers or an unbent paper-clip (anything as long as it's metal and will touch the reset point and the back of the battery at the same time). Maintain contact for about 5 seconds and you should get the display back.
I've just changed the battery in my SDB 500W and the above method worked. I did lose the audible 'beep' though and I'm currently on the net trying to find how to get it back. That's how I found your question... :)

The battery in your watch needs to be changed, this a warning the Bulova Millennia 98A48 gives before battery is drained.

I think it required cleaning for movement any expert watch maker will do it ,,, and if you are in chicago we can clean it.
From

Amfix Jewelry & Watch Repair
203 N. LaSalle Street
Chicago, IL 60601
Ph : 312 641 7000
Email: [email protected]
Web: www.goamfix.com

Dude, of course it stops during the night - it's a perpetual motion / kinetic watch. It doesn't have a conventional battery. When you move your arm (while wearing it), the natural motion of your arm will 'automagically' wind the watch. There's nothing wrong with it - these types of watches always have to be re-set in the morning if you don't wear it to bed (or you don't toss and turn in bed).