As great as mirrorless cameras are, one area where the good old DSLR still reigns supreme is battery life. For instance, the Nikon Z9 has a CIPA-rated battery life of 740 shots, whereas the D6 can manage an incredible 3580. In real-life shooting the Z9 will likely do much better, but the fact remains that using an LCD display for live-view shooting consumes precious battery life.