I recently used a supercharger and noticed it seemed to take longer to charge the battery than before. I think it was taking longer to charge it at home as well (using NEMA 14-50). I took pictures of the battery pack today and noticed it was a "B" version. Unfortunately, I never took a picture of the battery pack prior to the Ludicrous upgrade. My car was ordered in May of 2015 and I took delivery in late July 2015. Is there a way to find out the battery pack version that I originally received ? I think a 2015 build should be either D or E. The B seems like an older version. I was planning to go to the service center soon to discuss this issue.