I'm using iPhone 11 with my Discover Media via wireless connection over CarlinKit 3.0. And I have to say that battery life is fine BUT I had to make sure that the GPS option is enabled in CarlinKit advanced settings.
CarPlay dashboard shows your current position, so it requires the GPS receiver to work all the time which will drain the battery much faster. However the GPS option will make sure that your phones GPS receiver will not be used. Your cars GPS antenna data will be passed though via the dongle to the phone. This saves the battery + your position will not be lost in tunnels etc. since the car will estimate position based on other data (wheel speed and steering angle postion).
CarPlay dashboard shows your current position, so it requires the GPS receiver to work all the time which will drain the battery much faster. However the GPS option will make sure that your phones GPS receiver will not be used. Your cars GPS antenna data will be passed though via the dongle to the phone. This saves the battery + your position will not be lost in tunnels etc. since the car will estimate position based on other data (wheel speed and steering angle postion).