Had a new battery fitted to my Merc and within a month went flat, so they sorted a new one out and fitted it, unfortunately because the first battery went flat the SRS light came on and the fitters machine could reset the light because his electrical device did not do the CLK Merc. He said take it to a nearby Halfords which I did and they didn`t want to know, suggesting I went back to Tyres on the Drive. I went back only to receive an email that said take it to an electrical mechanic to see whose fault it was. Halford get a one star but as far as customer service is concerned get a big fat Zero.