yes, good point! the battery is approx 2x thickness but the aids are not…at least the Phonak marvels I was looking at. That’s what I was referring to when I said they were only negligibly thicker than the 312 model.
I looked at it pretty closely when I was deciding. Don’t recall the numbers now but the actual energy stored (amp-hours) was as I recall also about 2x what’s in a 312…so I came to the same conclusion as you… twice the life and the aids were the same price
I guess I’m old fashioned but I still have zero interest in rechargable. I like only fussing with them once a week, no anxiety did I get them seated in the charger ok…am I going to be able to hear tomorrow
and on the rare occasion when I’ve gotten a weak set of batteries and they fail early, I can reach onto my key chain or into my desk drawer and in about a minute I’m back up and running… or I can pop into almost any store and buy some