So I have the Samsung 15W wireless charger. If I put my phone on that charger, then put it on the BMW wireless charger in the car, the time to reach full battery is about 3x longer. This tells me the BMW charger is 5W, which yeah, is not great. The USB C port in the storage compartment under the armrest is 3A, which means it can deliver about 15W, so that's the fastest charging option.
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