05-19-2019 10:15 PM
Hello @megacliff58211. There is not much difference in battery life considering HEVC setting alone. For the HERO7 Black, using HyperSmooth Stabilization or TimeWarp modes could lead to about 20% shorter battery life as observed by an expert here.
For reference, the expected battery life per resolution setting is listed in this article. Feel free to post back for any other concerns or questions. Stay stoked!