I have a question for tag heuer 2000 exclusive automatic

You need sharp nose pliers to unscrew the back and small screw driver to pry out the battery for direct replacement.Maybe 325 but you have to buy fresh ones from Radio Shack not drug stores.

Links need to be ordered from TAG.They cost about £30.00 per link best contact www.rolexrepairs.co.uk if you send them the watch they will supply and fit with a free estimate first.
Regards

mcdevito75 here, Best Bet look for a small watch repair shop im your area to change the battery.

YOU have to buy new one. Will be costly. Check out e-Bay. Cheapest prices are there.

push the crown in if it is in the adjust position .then shake the watch around the auto mechanism sould start the watch

download a instructions for g300 g shock watch

They were just hiding it:
http://ww2.tagheuer.com/_documents/manuals/EI2252_en.pdf

-Tha Mp3 Doctor

If that buttun is pushbutton, then the fixing stopwasher has come off (inside watch).
If you meen the crown (winding and setting button), then setting lever or setting lever spring is damaged or broke.
Find your nearest watchmaker as both need professional repair and parts.

its actually a new battery needed rather than a service.