Being an old phart, taking A level physics in 1970, my memory is a tad hazy. Electrical energy, which used to be measured in joules, KWhr seems more common now, which remains voltage x current x time.
A battery has a maximum energy density, which will decay over time judging by my iPhone and varies with ambient temperature. Unlike ICE, an electrical motor can deliver instant torque, which despite the extra weight of a BEV, delivers impressive initial acceleration, drawing a maximum regulated current from the battery. Power from a gas turbine varies with the density of the ambient air, both temperature and altitude. They are “flat rated” to guarantee no fall off in performance to a given temperature. I suspect that the control systems in a BEV are also sophisticated in order to regulate max torque and hence acceleration.
from what I read, the one acceleration figure that is beyond doubt, is the rate of depreciation. There seems no shortage of 900 bhp (675ish KW) planet saving BEVs, no doubt competing for bragging rights from their ostentatious buyers. I met Sir Colin Chapman a couple of times, whose mantra was “light and agile” I doubt that he would have envisaged a Lotus Eletra, weighing @ three times an Elan, built in Wuhan and containing a monstrous battery. Such is progress.