Key coincidence...A bit of a ramble.
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Just a couple of days ago, I too had a message flagged up in my non-Morgan advising to change the battery in my key.
I have known of button battery terminals to come with a self adhesive insulation material stuck on one side, which requires to be removed prior to fitting to whatever device... No such insulating coating or material noted on any of the two replacement batteries... and that I was able to measure the voltage available on each of the two batteries, seemed to confirm there was no such insulating coating.
Generally there is some sort of spring action which maintains pressure in terms of the electrical contacts in the device, and when installing new barreries the spring action can wipe the area of contact between device and battery to assist in making good electrical contact.... Often battery operated devices left unused can fail to operate just due to dirty points of connection at the battery building up over time, either on the device or on the battery, or a mix of both...
With the above in mind, given the key`s operation was restored with the old battery re-installed, it seemed that the keys connection point to the battery was not in doubt,
Becoming increasingly dismayed with my electrical incompetence, I found some light grade steel wool and gave both batteries a gentle rub with it on both sides..... both battery`s now operated in the key when tested.
I now carry a spare new battery in the glove box of the car, along with a small piece of steel wool too...!
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Any comments on my trials and tribulations gratefully received as ever...
I've come across the same problem on the Volvo forum. Duracell batteries have a Bitrex coating which can cause problems.
https://www.duracell-me.com/technology/lithium-coin-battery-safety/
