Only from a refueling (and battery heat) perspective though...

The majority of the lemans (or any endurance race) challenge is not from the electric drivetrain (or regenerative braking) but from the ice drivetrain and friction braking. This is reinforced by the ease that WEC and IMSA have had in implementing electric hybrid drivetrains with relative ease over the last 10 years (by most measurements making the endurance more achievable).