The Outlander battery is 13.8 kWh (10.5 kWh usable) the Across 18.5 kWh (14.5 kWh usable) my understanding the Tuscon PHEV 13.8 kWh battery has a 11 kWh usable battery range.
Charging on Octopus Go for 5hrs tonight, it put in 11.5kW and it will charge to full or very near because of the 14mile range left and the battery guage is above quarter full.
If the battery guage is at 20%, when I charge it, it will be about 3/4 full after 5hrs, so it would need more tham 11.5kW to charge it to full.
The reserve lets say for it becoming a full hybrid, so your never on ICE only is typically at 20% on the guage, but can go as low as 15% or a tad lower depending on how your driving, with the lowest I have seen it at is 12%, so there is no dynamic guaranteed cut off % befor it switches to hybrid.
There is a 11kWh figure thats come from somewhere (autocar) and is discussed on the Tucson forums and several have mentioned putting 13.8-14kWh on Hypervolt and Pod Point chargers. Even with any loss or 0.5 meter innacuracy, it’s still be higher than 11kW put in, but who knows lol.