Tried to start my 2015 500e today, it was showing a 50% charge earlier but got a "service electric vehicle system" message and the battery meter showed zero and it went into "turtle mode". I had to get it towed from the parking lot to my house. I reset the system by disconnecting the battery, but still the same issue when reconnected. - 0% battery, internal electrical system works (stereo, etc) , and "electric vehicle system warning light" light is on. The internal electronics still run so don't know if it's the 12v battery, the car only has 10,000 kms on it but it is the original battery and haven't used it much during COVID. I'm in Canada so don't have anyone who can service the car. Any suggestions would be welcome on how to approach the problem? Replace the 12V battery?