Today I replaced my battery and decided to swap the ‘croc clip fly lead’ on my CTEK MXS 5 battery conditioner for the ‘eyelet fly lead’ - connecting the lead directly onto the positive and negative terminals on the battery which prompted me to have a quick look at the manual. The manual says for batteries mounted inside a vehicle you should connect the negative (black) clamp to the chassis away from the fuel pipe and the battery. For years I’ve been connecting the croc clips directly onto the battery terminals – are CTEK being over cautious or should I now separate the black clamp?

2016 Aero 8 S5