Buddy: Just ask, most of us are open to gear swapping, lens testing etc.
The milage of the big cams like D3, D4, D5 is in the several thousands of RAWs if one skips image review.
The milage of the D500 should be above 1000 with a single well conditioned battery of the "Li-ion20" kind.
The battery compartment of the D500 weighs 504g which is more than the whole package of the Fuji X100T including battery and card with 468g. I chose to leave MB-D17 at home.
Yet, for a day of birding the D500 battery compartement loaded with 8x"Eneloop Pro 2500" gives me something in the range of 10.000 shutter actuations (many more than I need).