Firstly, it's not a battery, it's a box of electronics, and it has certainly never got in my way. I've had the etsi model for a couple of months now and it is a fantastic car, best I've ever owned, it seems to pre empt my every decision and carries it out very smoothly. Brilliant car, don't be put off by the negative publicity regarding the infotainment system, I think most people don't take the time to find out how easy it all is.