I think the OP was talking about (aggregate) telemetry going back to facebook (crash reports yes, battery usage stats nope). Battery stats telemetry is almost

I think the OP was talking about (aggregate) telemetry going back to facebook (crash reports yes, battery usage stats nope). Battery stats telemetry is almost certainly only available to Apple, and not shared with third parties. (If you dig into your device's settings->logs, there are log files that seem to record every imaginable interaction with the device) Also, for a long while, ios devices that have mounted the developer disk image provide some extra battery logging in settings, but that will only provide insight on the developer's own devices.