While reading about battery degradation and best practices to maintain battery longevity, I got thinking about what State of Charge (SoC) my P85D's battery pack spends its time at and with what frequency at different SoCs. So in an attempt to get a better idea of the distribution, I tried to get the last year's worth of data from VisibleTesla (which I have running 24/7 on a Mac Mini at home) and compiled the data in a couple of charts. To preface the findings, here are a few points that may be skewing the data in one direction or another. Namely: The VisibleTesla data was exported as is using the File -> Export -> All Data menu item Each data point has several parameters, so I've deleted all but two: timestamp, and SoC (State of Charge) which is expressed in percentage values While I'm driving, VisibleTesla (VT) takes samples about every 5 seconds While idle and NOT sleeping, VT takes samples about ever 4 minutes While idle and sleeping, VT takes samples about every 33 minutes My VT is scheduled to let the car "sleep" at 10pm every weeknight (Sun-Thu) and 11:55pm on weekends (Fri-Sat) My VT is scheduled to wake the car up at 6:30am every weekday (Mon-Fri) and 8am on weekends (Sat-Sun) I have my car set to Energy Savings ON but Always Connected is checked My normal charge limit is set to 90% and I charge it every other day I've been averaging two 100% charges a month So there will definitely be many more samples while the car is driving than when it's idle but awake, and a lot fewer when it's asleep. With that out of the way, the two charts below represent the number of State of Charge data points collected for: Every State of Charge possible (from 1% to 100%, in 1% increments) - second chart 5% SoC blocks (1-5%, 6-10%, etc. until 96-100%) - first chart Results: it looks like battery pack spends most of its time between 56% and 90%. There is a spike at 90% obviously, since this is my charge limit and I don't usually start driving immediately after it's done charging. I read somewhere here that the battery likes it best between 50 to 65%, so it may be worth lowering my charge limit to 80% or even 70%. Thoughts? Suggestions? What do your data points show?