Here is the requested update 

The battery is right now at 3.533 Volt.
The mcModule is running the latest firmware available and Iam still using the same code that sends MQTT updates every minute.

I also have one module inside my refrigerator I use the same battery for that module and same code with updates every minute, it has been in the refrigerator for 26 days and the battery is still at the same voltage as when I inserted it to the module 3.596 Volt