got this sorted today at the dealers as this morning it was the same agian.
turns out that mark you are right. they are rechargeable.
there are actually 2 batteries in each card.
1 is a replaceable 2025 and the other is a rechargeable 1 buried in the circuits.
the replaceable 1 works the buttons and the rechargeable 1 works the keyless entry.
if you always use the keyless entry an never put the card in the slot(like me) the rechargeable one for the keyless bits will go flat.
it then takes upto 72hrs of driving with the card in the slot to get it fully charged again.
so you must put the card in the slot every now and then while driving to give it a quick charge.
you also must alternate using both cards as they will go flat if just left in the cupboard like mine.
it just so happened that my 2025 batteries were also flat in both cards thats why they werent working.
changed the 2025 batteries in both cards and they both work again.
cost me about £8 for 2 batteries from the dealers, but at least i can lock the car again.
turns out that mark you are right. they are rechargeable.
there are actually 2 batteries in each card.
1 is a replaceable 2025 and the other is a rechargeable 1 buried in the circuits.
the replaceable 1 works the buttons and the rechargeable 1 works the keyless entry.
if you always use the keyless entry an never put the card in the slot(like me) the rechargeable one for the keyless bits will go flat.
it then takes upto 72hrs of driving with the card in the slot to get it fully charged again.
so you must put the card in the slot every now and then while driving to give it a quick charge.
you also must alternate using both cards as they will go flat if just left in the cupboard like mine.
it just so happened that my 2025 batteries were also flat in both cards thats why they werent working.
changed the 2025 batteries in both cards and they both work again.
cost me about £8 for 2 batteries from the dealers, but at least i can lock the car again.