Which 12v battery for 2013 rex UK?

[quaycrest]

I think my 12v battery might need replacing as I am getting some error messages esp when HV battery is very low such as parking brake errors. So I wondered what battery to buy and from where in the UK. Although I am a bit concerned about a few cars being bricked after a 12v battery change!
Many thanks for any help or guidance.

 

[mojo]

In the UK it's about as simple as you can get: just buy one from a BMW parts department.