Casio G Shock Battery replacement

[G0ldfysh]

I have a Casio G Shock Solar powered, radio controlled GW-2000.
Picked it up this morning and all hands are at 12 O'clock.
Online suggests a battery swap, but last watch I took into a jewellers meant it was no longer waterproof.

Are there any companies (any recommendations please) that will still guarantee it as waterproof after the battery swap?


stock photo

[Pkh72]

Is it brand new or second hand?

I'd give it a few days on a window sill in direct sunlight and see if that gives it some charge before opening it up.