Thanks for the comments.
As I’m in New Zealand, Illumn do not ship to New Zealand (see thread here) unfortunately. So I can’t purchase anything from Illumn.
If the BL4 charger is relatively new, then I find it to be a bit odd as to the unavailability of this charger (now)? Maybe too busy making the Vapcell S4+ model charger?
Sort of as an aside: I already have the Vapcell S4+ V2 charger as of a few years ago.
But I am not entirely happy with this charger as it on odd occasion doesn’t seem to function properly. One instance was when trying to charge a cell (not sure if Ni-MH or a Li-ion) in the S4+ set on automatic mode but the charger failed to start charging the cell. Don’t recall if there was an error message or not displayed on the S4+? I think I tried another slot and the charger still failed to start charging the cell.
In the end I used my main charger, the Littokala Lii-600 (on automatic mode), to charge the cell. The Lii-600 charged the cell without any issue!
So not really interested in the Vapcell S4+ V3 charger as it has only very minor upgrades from V2, and it is possible the issues I had with V2 would still be present in V3 of this charger(?).
EDIT: From this thread, it seems the BL4 will be available (again) from the end of this month.