coding

As per the title, every battery centre I've asked thus far has said that they don't do coding when changing batteries, but instead plug in booster packs so the ECU doesn't lose its memory and the car will eventually adapt??? Any experience with this?

Anyone have a Carly or Other OBD2 thing I could use? Wanting to code a couple things like my side mirrors on my F30. Happy to give thanks with a pack of beer 😅 🍻