yeah the battery size will certainly be a problemFood for thought:
16 Pro Max: 4685 mah
16 Plus: 4674 mah
Galaxy Z Flip 6: 4000 mah
iPhone 13 Mini: 2406 mah (LOL)
I’m willing to bet that the 17 Air will have similar capacity to the Z Flip 6. Opting for a bigger screen = bigger chassis = bigger battery.