[Q] Cell standby battery drain topic

I have cyanogenmod 12 euphoria rom installed.. The cell standby is always number one battery draining source.. I have good screen on time but terrible standby time.. The battery goes from 100% to 0 on 7 hours of night.. I turned on airplane mode which caused improvement but still the radio burns through battery although my Sim card slot is broken and i have no sim cards..

Thanks in advance