Hi, would like to change the comfort battery with my SL500 r230 Bj. 2003 because it is quite weakened and therefore already error messages came to me, however, all immediately disappeared after the car ran and battery was full again. I read that the R230 should be very vulnerable because of the whole ECUs.. Now my question to the professionals here. Have a Varta AGM 70Ah 760A in mind. Would that be in order for my SL? And ever the most important thing, I can do this myself. and I have to adjust the window to the right impact like the steering impact? Do I have to pay attention to anything else? Would be great if someone could give me such a step by step instruction Thank you in advance Edit: somehow this appeared under brabus the thread. Have a normal sl500 no brabus..