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Hi everyone, I am new on this forum. Started to search the internet after having problems with my 2013 ED. I started to work in an other city beginning this year, at 50 km distance. Just too far away to do the out en return on one charge in winter with lights, heating and wipers on. So I used my Toyota Prius instead and put my Smart away in my garage, having 80% SOC. Last week I wanted to take it out but the 12V battery was flat. Connected another 12V battery with jump leads and the the dasboard lights came on but with an error that the engine was out. No SOC reading either. Had the LV battery charging overnight with 2 amp and the next that reading 12,6 Volt. But still no change in error massages on the dash. I had it transported to the Smart Center at MB. They called me few days later with there "diagnosis" that the 12V batt was dead, and that the HV battery was dead also! The dealer contacted with MB and concluded that replacement would cost me € 22.500 incl. taxes!!! I bought the ED at age of 2 year for € 17.500. Looking at the diy batterytester on this site, but testing alone would not help me out. My guess is that if the battery cells are slowly loosing there charge over time, one of them falls below a safety level and the software shuts down the entire battery. Maybe if the "bad" cell could be charged separate, or the entire HV battery could be charged bypassing the software ( having the relay in the battery close via a command on the CAN bus?) there is a possibility of recuperating the battery. You don't throw your laptop battery away on the first occasion it is discharged .... Hope you come up with some ideas, at least interesting to discuss. Albert