I have 2 X-T2's both with battery grip. That means 6 batteries in the cameras, and usually a spare set of 3 for each (12 total). I've shot thousands of images in a long day and never completely run out of juice. When I am on the street shooting events (which is often), even in very hot weather, boost on, not turning the camera off, I have never had such poor performance in terms of shots per battery as the OP had. At the heaviest use, about 200 shots per battery. More commonly 250-300 per battery.