B139 ARC with CarPlay Battery Drain

B1203 ROCK Core on NUC10i3
ARC B139 on iPhone 12 Pro, iOS 16.3
Wireless CarPlay on Pioneer DMH-Z6350BT

My iPhone 12 Pro is seeing a lot higher battery usage with B139, my battery dropped 37% in just under an hour of driving whilst using ARC with CarPlay. iPhone was fully charged when I strted the journey.

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