philly_ev wrote:My understanding is the the FFS only charges to 80%, but it shows to us as 100%.
It's definitely not as low as 80%, it's probably more like 95%. Very likely the battery is never actually charged to 100% either (which can be harmful).
The advertised total capacity of the FFE battery is 23 kWh. The well-known usable capacity 19.5 kWh, which is already 84% of the total right off the bat. But, the battery is never completely discharged to 0% either (also harmful). So, if we make a reasonable guess that a "buffer" charge of about 10% (2.3 kWh) is maintained at all times, then the total level of charge is something like 2.3 kWh + 19.5 kWh = 21.8 kWh.
Thus, the FFE battery, fully charged, probably holds something like 21.8 kWh. This is about 95% of the total capacity.