What size battery does a mens lucien picard model 26784D use

Watch bands come in standard widths so you can have any band you like. You local jeweler will carry a selection and they fit for free.

https://www.google.com/search?q=lucien+piccard+A2216BK+replacement+watch+band

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In the link, but the best way is to get it appraised at a local jeweler.

https://www.google.com/search?q=Lucien+Piccard+14K+gold+large+mens+watch+value

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I see your watch has a Seiko VD53 Quartz Chronograph Movement. Several possibilities come to mind - the watch may have a small plastic spacer under the crown which is there to stop the battery running flat before the watch is sold. If that's the case then simply remove the spacer and press the crown in. Possibly, the battery is flat and will need replacing, or you've received a faulty watch - either way (and I interpret your using the word 'received' as meaning that it was a gift to you) you should tactfully point this out to the giver. They wouldn't want to have wasted their money, and hopefully they've kept the receipt.

An automatic watch can be wound up by holding them level and swinging it from side to side and several minutes (one maker said swing it 200-300 times).

Once fully wound, the watch should keep working if it is worn daily. Most automatic watches will run for 2-3 days if not worn.

mcdevito75 Here, hopefully you didn"t buy the batteries all from the same store, as watch batteries and all batteries have a shelf life of not too long. You may have bought weak batteries if all were bought from the same store, nothing to do about that as who knows the strength of packaged batteries. If you did buy all the batteries from one store, try another store and buy another battery, If the watch still stops and goes, your watch may be wearing out, specially if the watch is over 10 years old.

mcdevito75 here, Best bet, look for a small watch repair shop in your area to help fit your watch and to save on the cost.

Take your watch to your nearest watch shop and ask them to do it for you.

You can get into difficulty replacing batteries and it is not worth the risk for the small cost saving.

You may need a new battery, but first check out this site:

www.tissot.ch

Rate me, please.

I suggest that your watch has an oxidized contacts and electricity can not reach the movement.
Do as folloes:
Take out the batttery,
Clean (scrape) all battery related contacts till they are shiny (use hardened steel needle for that),
Use the dust blower to get rid off any tiny dust and dirt particles after cleaning,
Refit the battery back.
Now your watch should work again.
If all written above do not help, then there is a problem with your watch and you will need the help of the watchmaker.
Do not forget to rate, please.