Way back when... in 2013... peak supercharging rate was increased from 90kW to 120kW. Some owners noticed that their cars immediately had increased charging rate, and others noticed that theirs stayed at 90kW. Tesla offered no answers. We, the early owners, started doing some data collection to try to figure out this anomaly. To make a long story short, we determined that, around December 2012, Tesla began shipping some cars with 120kW capable batteries. Other earlier cars did not have this capability. By end of spring of 2013, all cars were shipping with the new, higher charge rate batteries. We used correspondence on this forum and this table to determine which part numbers were affected. There were also worries (unsubstantiated) that the 90kW limited batteries may have other issues, such as degradation. Speaking as an owner of a 2012 P85 with the early 90kW limited battery, I can testify that my battery capacity is stellar. It has remained within 5% of what it was when I took delivery.
Nonetheless, at the time, the owners with charge rate limited batteries were aggravated, and petitioned Tesla to do something about it. They acknowledged the issue, but argued that the overall impact on supercharging time was negligible. They gave us a commitment that they would institute a "fair" upgrade program for all owners when battery production constraints eased. That has not yet happened. Hopefully when the gigafactory is online, they will give us some accommodation. Unfortunately, the exec who worked with us on this issue has left tesla (Jerome Guillen), so who knows what the corporate memory retained.
Regardless... there are a few early owners who helped Tesla sell a LOT of cars, and are owed something. Some of us have not forgotten
