UK-POLOS.NET - THE VW Polo Forum

I currently have a Polo Match 2008 (1.2litre) and im interested in getting the RCD360 to replace the radio module within my car, and ive heard really good things from most people, but i have heard one thing about battery drain, now im sure the battery usage will increase from adding this RCD360, but does anyone know how much it really affects the cars battery?
Thanks and please let me know!