the device I've been about 4 weeks. Delivery within 24 - very good. I still have a scale expected to charge state, but it goes that way. Bin so far satisfied with charge cycles over 2-3 days a week. My car battery is 4 years old with little driving kilometers. Hope I get to the coach well over the winter and possibly battery sludge is reduced. In the spring I can evaluate the performance of B.trainers better. MfG G.TH.