My battery seems to be failing. 85d with 85k miles. Since buying the car used I have been good to the battery pack - limited supercharging and typically keeping in 20-70% charge range. Did an experiment and ran pack low to 7% and then charged all the way up to 98%. Downloaded file from charger and pack only took 63.9 kw. That's total and must include some energy for pack warm/cool etc . . . This seems pretty bad. Also tried supercharging a couple times for a few minutes and capped below 50 kw. Any suggestions, should I bring it to a service center? Should I fight for pack replacement?