Battery drain ~15% per hour on standby

Hi,
I'm running CM 12.1 over S4 I9500 intl. and witnessing some battery issues - about 15% per hour with the phone doing nothing.
1) Deleted sucking apps, leaving only whatsapp.
2) Tried a different battery with same results.
3) Bluetooth/WIFI/GPS turned off, auto brightness is on


Here are some screenshots with some battery stats / wakelock detectors:
imgur.com/a/JUmLF


Can you find something abnormal?


Thanks a lot.

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