Battery left getting worse. topic

Had amazing battery life when running the stock kitkat ROM and even when running early stock Lollipop builds. Now I'm struggling to get 5 hours out of the device with moderate usage - Streaming music, scrolling on social media apps and the occasional browse on the internet. Been having this issue for a while now but it's starting to get irritating when I have to carry a charger around with me like an Apple user, issue has been present on pretty much every ROM ranging from CM based and stock based which leads me to thinking it's a device problem.

Anyone know how I can check what's draining my battery as the battery stats doesn't really help, downloaded a wakelock detector but I can't make sense of it. Currently running ChupaChups 4.1 on a D855 model.

Cheers.