Battery life?

When I first bought my s6 active, I averaged 6 hours of screen time. Around my home, which is out in the sticks and not close to any towers, I still get about 6. This is with no wifi. ANYWHERE else, I'm luck to get over two hours. It's constantly draining like signal is bad even though I'm in good signal areas. Really about done with this phone.
 
Battery life was better for me before the 5.1.1 update but it's still pretty good compared to most android phones. I can get through a full day 8AM-Midnight with about 40-50% remaining.