On the launch live stream, one of the commentators said that he used the a9 all day, took 2,200 pictures with autofocus, and still had 40% battery life remainin

On the launch live stream, one of the commentators said that he used the a9 all day, took 2,200 pictures with autofocus, and still had 40% battery life remaining -- This is approaching 'solved' for the majority of camera users. I've got an older mirrorless with a subpar battery so I'm definitely sympathetic to the issues but anything over a few thousand pictures is good enough.