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Battery Usage Stats

I've been having battery issues with my T-Mobile S6 since I got it. I'll go to bed with my battery at 80% and wake up and it's at 15%. I'm not even using it so why is the battery draining like that. I have Bluetooth off and WiFi is off.

My top two battery users seem to be cell standby and Android system.
 
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Cell standby is the phone searching for signal and will consume a lot of battery. There is definitely a difference in antennae signal strength with the S6 compared to my S4. At my home cell standby usage can be as high as 20% with a signal strength of around-115 dBm and at work it rarely hits above 5% with the S6 and the signal strength is around -93 dBm. My S4 was in the 7% range in both locations with -97 dBm in both areas. I can get a full 3 hours more battery life at work than I do at home. On older phones there was a method for updating the PRL that would help the phone better connect with cell towers in common areas but I have no idea how to do update it on a Galaxy phone.
 
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