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True, conventional keys also use batteries, but as you say their battery life is longer... considerably longer (than that of mobile/cell phone battery).
If the battery life is anything like my phone, it will struggle to last a day without having to be charged LOL.
Wireless charging inside the car sounds like a great idea, but it depends on how long it needs to charge up. Most of my journeys will be short distances, thereby not allowing much time for the Display Key to charge up in the car.
Problem is we don't know much about the Display Key (and how it works) as BMW are keeping tight-lipped about it.
T
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