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Originally Posted by sdorn
Well that would be stupid to put rechargeable batteries in one and non-rechargeable batteries in the other.
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Read your manual. That’s the way it is. This is an old debate and I’m sure you can join that thread by searching for it.
The general consensus is BMW didn’t want to ask customers who paid extra for CA to have to put their key in the dash every few weeks to recharge. One of the selling points of CA is not having to place your fob in the dash. So twice a year or so your car will tell you to change the battery in the fob.
Those who are always placing their fob in the dash (non-CA customers) are getting a charge so its one less inconvenience for them. But they do need to use their spare fob every couple months to keep a reserve charge on that fob - which seems like a pain to ask a driver to dig out their spare fob every few months to maintain a charge just in case they need the fob down the road.