You will never get that battery if it makes the device thicker. I was in the industry, we made smartphones with a two day battery. Full on thick, in direct response to customers asking.
None sold. Period. It was something like 8-10mm thicker.
Everyone looked at the one with the thick battery then the thin and bought that.
Marketing maketh the product. Absolutely true and a thick one there would sell.
If you put two devices down, one thick and one thin, all other things being equal and without an influencer hawking jt. People take the thin one.