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CA keys are not rechargeable, they use a simple CR2032 battery. You can put the key fob in the ignition slot but it does not charge. The non-CA key does charge in the ignition slot... It has been this way since CA was introduced, having had CA on my '08 550 and and my '11 M3.
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2021 X3 M40i
1974 2002tii, Inka, 5 sp manual
BMWCCA # 327475
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