[Q] Battery Monitor for my current setup? topic

I don't ask many questions, I tend to look it up and figure it out on my own, but now I would like some advice.

I'm running the latest kitkat Dirty Unicorns, on my T-mobile s4 SGH-M919. I'm using knootsen's Ktweaker kernel. I installed it just the night before today and my battery life was awesome (I applied some tweaks like OC and UV). I'm not asking for advice on my setup, but after some sudden battery drain that I can't explain, that also happened before using this kernel, I was wondering if anyone had a suggestion on the best app to give me detailed information on what is using my battery.
Thanks in advance!