What model is Omega female seahorse battery? Can I buy my own battery and change it in a small watch repair shop? Does it affect the watch? Mine is a diving watch, 300.

Don't buy your own battery, because you don't know the model until you open the lid, and there is no professional tool to open the lid. Ordinary unprofessional opening of the lid will cause damage. You can change the battery in an ordinary or slightly better watch line and then watch him change it all the time. It is recommended to change it to a slightly more expensive one, but the most expensive one for ordinary watches is only thirty or forty yuan. Compared with the cheap one, the service life is basically longer, and the loose seal caused by frequent opening of the case is avoided.

I hope it helps you.