EPA document, Tesla always uses (so far) the nominal pack voltage. 816 V x 150 Ah = 122.4 kWh
And that number lines up way too well with one of the possible configuration. I did a long post, that I can't link here sadly, going through all the possible battery configurations and there is really few options that line up with ~ 800 V, pack being able to split in two, ~123 kWh and close to 1366 cells
All other ones apart from 220S6P diverge too much from the requirements above
I think we have heard that the cybertruck pack is (really? metaphorically?) four 200-volt packs or modules. There are switchest to connect two pairs of those in series (for charging on 400 Volt chargers) and to connect all four in series (for 800 Volt chargers).
Does 220S6P align with that?
(honestly asking...I understand the basics of series and parallel and how to add it up...and something seems odd about a 6P system being divided into four...but I really have no expertise on this.)