Hi everyone,

I own a 2011 S5 Sportback with 62000k I have decided to replace my battery as the old one is failing to hold its charge after standing a few days. I have bought a compatible battery and done a little research and can find a few pointers. I am not sure if I will lose my radio whilst swapping over the battery so I plan to hook it up to the charging terminals and my VW Amarok (good or bad idea?)
I have a OBDEleven on order but not the Pro version yet as I don't know if I can enter the codes on the none Pro version I will be able to upgrade via the app should I need too.
Has anyone done this before?
Can anyone provide a step by step guide to getting this right? There are a few bad stories of multiple systems not working if its not done correctly.

Thanks in advance for any guidance you can give.

Russ