For the Yukon Quest finish I captured 657 frames and the D500 reported 50% battery charge left while still cold (-7°C), 60% after rewarming, most captures short bursts at 10 frames per sec. So at room temperature I would have expected to get 1657 frames if the battery was run to 0%.
Tonight I captured 422 frames at the Ice Alaska (ice carving) festival and the D500 reported 7% battery charge left while still cold (perhaps -10°C at the start, -16°C at the end), 17% after rewarming. Most exposures were on tripod at ISO 100, several seconds long, reviewed almost every frame and I used live view for perhaps 1/4 to 1/3 of the frames - sometimes forgot to turn off live view when moving between sites, actively shooting for a total of > 4 hours. Standby timer mostly on 6 sec. or 30 sec.
In other words, this is just as expected from our above experiences.
[Edited in battery charge after rewarming and corrected the number of frames. Also flight mode was on and no wifi etc active. (in response to Frank's question below).]