Pint/vesc running 18s1p

[Lemur]

Pint/vesc with 18s, I'm currently running 16s1p on my Pint/Raiden 7 now but I'm planning to run 18s1p.
Looks like there is room for two more cells where the original bms was, the red outlined area is empty and that's where the 16th cell is placed. There is no internal bms but I can use an external bms to charge the battery whenever I open up the battery box.
I'm waiting for a damaged Xr green pack so I can salvage a couple of good cells.
The picture shows an Spintend ubox which maxs out at 16s, but it's just a mockup.
I just received an 18s 3amp charger from Aliexpress because I was not really sure if the Gt charger was 18s at the time I ordered the 18s charger.