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Hi @hamitozturk
It's not necessary to post your question in the forums and through the Web API Help page. We answer questions in both locations regularly.
As I mentioned before, Fitbit does not offer a SDK for the Inspire devices or other trackers. The SDK is only available for the smart watches (i.e. Versa and Sense family). The Web API's Get Devices endpoint, https://dev.fitbit.com/build/reference/web-api/devices/get-devices/#Response, can provide you with the battery status. You can populate this information into a 3rd party application for iOS, but on the device itself.
Gordon
Best Answer