when renewing my | mazda cx3 key I discovered two small 1.5mm diameter grey *****, lying loose inside the key, it looks like lead. Does anyone have an idea what these ***** are for? I am the first owner of this car and therefore also open the key for the first time

 

Checked again.... There sort of gummi- soft grey ***** without any function ( I guess ) ?
Standard battery is a Panasonic 2025 (lithium? )3v - should any 2025 3v battery be oke?