Just wanted to say a quick thanks for the advice in this thread. I had the same issue on my 2021 plate (SOS Call Error on dash). My local garage said it was a 6+ month back order for a replacement battery - ouch!
I already own a Carista, but clearing the error didn’t work as it came back straight away. After reading this thread, I took a punt on the OBDeleven 3 Pro pack. Worked a treat — error gone and the red light on the SOS module is now back to green.
Many thanks all! Probably saved me a few ££ rather than going to a garage too!