Replace defective screws on the housing cover, Battery change

Beschreibung des Auftrags

Dear Ladies and Gentlemen,

I have a Polar heart rate monitor and would like to send it in for repair.
I need a new battery and one of four screws is missing from the case cover. I tried opening the case, Unfortunately, I damaged the screws and couldn't get any further because the screws are secured.

According to the manufacturer Polar, they no longer offer a service for the watch, because it is an older model.

Modell Polar F55 , Battery according to Polar CR2032.

I am sending you two more pictures of the watch.

I hope you can repair the watch or replace the battery and screws.
How much does this service cost?

With best regards
Nicolai Ackermann