I recently paid £1.20 at a motor factor. Prised open the Korado key. swapped battery. 30 seconds. I did watch a you-tube video first naturally.

BMW E46 keyfobs contain rechargeable batteries soldered to the internal circuitry, making them non-removable like standard CR2032 cells. Opting for The Master Locksmith to handle the repair, rather than paying £206 for each replacement fob from a BMW dealership (since BMW no longer issues replacements to independent garages), was a straightforward solution.

[When I first bought the car from my sister, only one fob was working. A couple of years later, that one failed. The independent garage obtained one for me at a cost of £124; hence why I now have three].

A well known accessory chain changed 2 x fobs from a RAV4

She bought something else, sticky pads for number plates,

From memory she paid something like £41.00.

2 x C2023s can be under £2 each. She said "I do not understand techie stuff"

I would hardly describe prying open a key fob with a small sharp screwdriver, flipping out the expired CR2032 and inserting a no more than £1 (they can be as cheap as 50p on line) replacement as 'techie stuff'. Did she also buy a £4 cup of coffee while out? I never knew BMW soldered them in......that really takes the biscuit!