Thats interesting, when ever I test it (every night ), I have a battery drain of approx. 20%. I change always to offline mode, so there is no traffic.
Last night it sadly crashed after 30 minutes, but my battery consumption was still 10% (offline, 9h).

I do not know yet why it crashes, but I experienced it before in one of the older versions. If somebody experiences the same, please let me know!
Usually python gives an error in the terminal, but I never could watch it crashing.