Interval and service life of RDKS?

Hello together, I bought a used Peugeot partner year 2015 at the end of April. The vehicle was sold to me with the summer tyres, which had already been pulled onto the vehicle during delivery in 2015, the tyres still look great, have still a lot of profile and are obviously not yet “hard”. In order to provide for the winter I bought a set of worn out summer tyres (only because of the rims). So far I have always bought my tyres online g of course I used new valves for every new tyre assembly. Now I have a vehicle (my first with RDKS) with active RDKS and have thus also installed sensors in the rims. The 4 sensors incl. valves cost on the internet from just 120 €. Do I now need new sensors for the winter tyres when changing wheels or can I continue to use them until one is defective (or battery is empty? ) ? I would like to have new valves on it, but 30 € per valve with RDKS is already happy. All how many years should you, or do you have to change the sensor? Sorry for the long text, but this topic has occupied me since I bought the car^^ Thank you for your help!