You have to ask them what level the State of Charge (SOC) the 60 is limited to. It is hopefully "in the middle" rather than just lopping off the lower-end of the SOC.
Let's say a 75 "100% charge" is the state of charge range from say 2% to 98% (~4% off a ~76)
The software limited 60 should be from 10 to 90%, for example (20% off a ~76)
The range should not be from 24% to 98% just "stopping" when the voltage hits 24%, let's say.
(Percentages are based on the main pack's voltage reading overall for EVs)
If they can prove that the 60 software limit is "in the middle" then charging fully daily should be possible.
If they cannot explain what the SOC "range" is - escalate that question to the factory staff and get back to us. You should know this detail when thinking about treating the battery well.
Tesla would also want to use the middle range, or even the lower range, such as 4% to 84%. I don't like seeing Li-Ion getting near the top 5% or bottom 5% in anything but I think it is one of the reasons some Li-Ion products (apple, for instance) go bad sooner rather than later - they may be using the full state of charge and not limiting the top and bottom reach of the state of charge (SOC) range.
State of Charge is basically from about 3.0V on the low end to 4.2V on the top end (and varies based on Li-Ion chemistry). I think I read that the Panasonic cells have a low voltage level below 3.0V. You do want to keep it off the "knees" of the graph. So, 4.1V down to 3.0V is a reasonable range. Range charging pushes it to the battery's rated maximum voltage, which also isn't recommended to be done "often". 20% of the 3.4mAh battery would be a 2.72 mAh window - however look below. Tests of some cells only allowed for 3.2mAh until it dropped to unsafe "post-knee" levels done by someone who picked up cells similar to what Tesla uses.
If I were to program the 60 "range charge" using the 75 battery, I would take it from 4.05V per cell down to 3.2V to stay in a healthy window. They have basically built a Chevy Volt battery profile by doing this - very good for the health of the battery. And as you may know, many MS90 owners who drive under 100 miles a day may charge "up to" 75% rather than a higher level daily. This keeps the battery healthy. Some have written here that they wanted to always range-charge, daily, "in case of emergency" arising in the family and the range being needed. I don't see that as a viable choice.
Test of Panasonic NCR18650B 3400mAh (Green)
Overall, the health of the 60 battery (using a 75 kWh battery) put through daily range-charges will be more healthy than 75 and 90 batteries which are range-charged often, years later, due to better automatic SOC range treatment - but only if they use the "middle" range of the SOC.
/Panasonic%20NCR18650B%203400mAh%20(Green)-Capacity.png)
