Originally posted by D1N0 Pentax has a 7.2v 1860mAh (14Wh) battery. Nikon has a 7.0v 1900mAh (14Wh) battery. Almost the same. Yet Nikon gets more than double the shots out of it. How so? I think Nikon has tuned their camera's for CIPA testing.
I suspect Nikon has what MFT cameras have which is a quick power down feature when the eye is not at the VF and he screen is set to quick off. this limits start-up time a bit. That and lack of in-body SR which likely counts for 20-30% of the difference.
ogl, with many Nikon FF lenses you need the grip, so the cost delta between the D850 and K-1 grows considerably.
The battery efficiency is probably not a major sales impediment as the price delta is still substantial and that is an acceptable trade-off for those looking for value over pure spec.