I've just brought a BMTechnics lead and downloaded their software package. I won't be doing any serious stuff, just want to be able to check fault codes and keep an eye on DPF and injectors etc. One thing I didn't think of is that the car battery needs to be on charge, according to BMTECHNICS info. I live in a Cul de Sac and the car is 100m from house, so it's a problem getting power to it. Is it essential to be charging the battery, if I'm not going to be fiddling with the car for hours and with some of the tests like DPF pressures and Injector values, I presume the engine will be running, so should sort the problem.