About the same, maybe slightly worse. Waiting over 1 month for the battery seems reasonable to reach full capacity, now ipad os 15 will probably be doing lots in the background for the next few days.
Something I find really problematic is the battery usage in settings. Its all over the place and not very accurate, not really understanding why theres so much background activity even with background app refresh off?!
I have disabled siri and all these other settings and only have screen brightness at 50% but still after a month now its ? but then again most apple battery powered products are the same. (iPhone is probably the most reasonable)
If you look at what they say my real life non lab experience is so far removed from the American Apple Dream
Even with the same settings mentioned here -
after 2 hrs into Inherent Vice battery is down to 52 % from 100 - Movie purchased and watched in Apple TV screen at 50% brightness no other apps open and the HD movie was downloaded on device.
Based on real world usage you can watch video content for 4 Hrs not 10 hours
Its a no brainer that all companies exaggerate specs / performance but this is sadly another example of Apple mis selling and mis describing their products.