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Of course there must be a maximum voltage limit and it depends on the chemistry. The question here was, if the i3 also leaves some buffer at the top. As you can see from the discussion, the i3 charges the batteries up to the maximum voltage given in the battery specs from Samsung SDI. So they...

Yes, I also found this post from "Havrla", who is well known in Europe for his 60Ah -> 120AH battery upgrade skills. As I said already, I did not yet see OBD2 read outs for the 60 AH i3 and I have not yet seen the specs for the Samsung 60 Ah SDI cells. May be that for this one, there is some...

On the lower left corner of the screenshots you see the (max.) voltage on cell level and beside that with smaller numbers the range between lowest and highest cell voltage measurement across all cells. Both examples show 4.19V as highest cell voltage (cell levels ranging from 4.18V to 4.19V). So...

Dispite many other statements, the i3 does not hold back a buffer at the higher end of the cell voltage range. The buffer only prevents exhaustive discharge. You can see, that it charges the cells up to 4.20 V when reading out data from the OBD2 connector. See also...