Hello people, the following problem has my 850. Old battery after a few days and then three times only short distance (2 times 3km plus morning and evening 20 min of floor heating) empty. That’s clear to me was not a good idea and the driving distance can not charge the battery! Since I didn’t want to exchange it for long and ordered for 100 cruisers a 60Ah Varta and after delivery a day charged ( charger a Ctek 5.0) a built up and start attempt! Super Starts as well as for long no more. Everything set again (radio, clock in the combination instrument and heater) just for this morning and 20 min after start of the stand heating in the car and key around, kotz gürg organ organ organ, just started!!! So nix drive but only again to the charge. Just checked with my Zangenampermeter and 100 mA rest current, stand heating and measured. This pulls still at start 6A and levels it at Vollast at 3A. What I had to do with the heater is quite a bit of the time that I can measure the old school with a lot of time!