Google’s collection of “Compatibility Definition” requirements for Android 6.0 Marshmallow includes a clause on battery transparency. What you’re going to find there – if you’re a manufacturer – is a note on Power Consumption Accounting. While manufacturers working with previous versions of Android had a bit more freedom in what they did and did not show to the end user, this version requires that device implementations of Marshmallow “MUST be able to track hardware component power usage and attribute that power usage to specific applications.”
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https://www.slashgear.com/android-marshmallow-demands-devices-show-all-battery-info-22411066/