Izzi, I assume you have a snap back back that won't snap back in place. I had the same problem with a Timex EXpedition. The solution should be similar. See my post"
and also the site I reference there.
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There are plenty of charts for battery equivalent on the Internet.
so open and remove battery then identify or bring to battery store to purchase new one.
opening the back you may need spanner type tool.
it may be easier to just bring to battery store for replacement.
i purchased tools and batteries from Amazon for doing watches in family. Figured saves about $80.00.
proper tools will help don't forget a closing clamp for snap close styles.
to change the battery in a champion watch:
(1) remove the back, (2) carefully peel loose the foam strip and set it aside (3) release the battery retaining bracket with a needle or awl and tweezers, (4) grasp the case with your thumb and forefinger so that your thumb is holding the works inside the case, (5) turn the watch over and the battery should fall out (6) put the new battery in the holder, (7) snap the retaining bracket back in place (8) replace the foam strip (9) replace the back
The open code is saying that your case isn't closed properly. Without seeing it, it's hard to tell if you opened/closed the case correctly. If you believe it is closed properly, look in your user manual and see if there is a master reset button and try that. Did you change the battery yourself or did you have a jeweler do it?
It is possible. Open the watch case back, memorize all the writings on watch battery as well as how the battery is positioned (+ and -). Buy exactly the same battery, replace it and close the case back. To be sure case back is closed as tight as it was, draw fine line across the case and case back with non-permanent marker. This will help you align when closing the watch and you can clean it off later. Rate me, please.
I dont recommend anyone change their own battery unless they have the proper tools to open and close it! If the case back unscrews then you need a case wrench...if it pops off with a knife then you will need a case press to close it or else risk breaking the crystal! Most require equal pressure around the entire edge of the case back! Save yourself time and frustration and possible damage and take it to a reputable watch repair shop!
I would not recommend changing this battery yourself unless you have the proper tools to close the case! If its a screw back then you will need a case wrench to close it otherwise you will scratch the case and case back! Plus it has a touch sensitive crystal! Screw that up and you will have to send it back to Tissot to have it repaired! That will NOT be covered by the warranty!