>>3853695>Based on my personal experience, CIPA ratings *overestimate* the amount of photos you can take per charge with mirrorless and *underestimate* the amount for DSLRs, so the gulf between the two is probably even bigger.CIPA underestimates mirrorless battery life as it iterates a routine that also let the camera sit for a while without action.
I've often heard that with mirrorless, it's not the number of shots that matters, but how long the camera is switched on, as the image sensor and displays are continuously running, being the main power consuming components. There were claims with numbers 1200+ for the badly rated Canon full-frame mirrorless.
Image related and
https://www.cipa.jp/std/std-sec_e.html 