I really don’t understand this fixation on internal batteries from users. It’s almost guaranteed to be the first thing to fail on your device, and turn it into e-waste.
I remember a Wirecutter review on beard trimmers, where they outright dismissed any product that didn’t have an integrated battery that lasted more than an hour. I trim my beard about once a week and it takes me less than 5 minutes. (Sorry for the unrelated rant here, needed to get it off my system)
It’s called a “rhetorical question” for a reason.