Hello, I am not sure where to post this so I apologize if it is in the wrong place and if so could someone tell me where to post it. I have underfloor heating with DEVIREG thermostats which are rather old and not holding the information. I have opened one up and there is a button battery which I assume is rechargeable. Can someone tell me the type of battery. It is soldered in place and I cannot read what is on it due to a band fixed across it. Thank you all so much
