SOS battery replacement - pretty easy to do yourself

After OTA software upgrade, my car started to show the SOS call limited error message.

When checking with OBD11 it reported Battery Service Life Critical (I believe that is 5-year time based and a sneaky money making trick by VW group) and Battery Flat errors.

Read widely online that this costs upwards of £400 for Skoda to fix.

I brought the replacement battery 3G0 915 089. Did not trust AliExpress units enough, so paid £130 for the original. Skoda price is about £100, but out of stock.

Instructions are exactly the same as many YouTube videos about doing it for VW ID4. Pull up rear bench seat by hand. Pull back carpet quite far. Pull out the communication unit. Slide it out of the plastic cover. As the connectors are rather fiddly I did not undo all of them (only the power and data). Replaced the battery and put it all back together. Then drove the car for 2 days to make sure the new battery was fully charged. Then used ODB11 to reset error messages, (in the OBD11 'Apps' menu, it is called 'Emergency Call Battery Reset'. This costs £29 it tokens.

Error message is gone. About an hour of work.