Well there are: https://data.energizer.com/pdfs/l91.pdf https://data.energizer.com/pdfs/l91.pdf But the problem isn't just capacity its maintaining the tradit

Well there are: https://data.energizer.com/pdfs/l91.pdf https://data.energizer.com/pdfs/l91.pdf But the problem isn't just capacity its maintaining the traditional zinc-carbon voltage profile. There were a bunch of much higher capacity Li/AA batteries from various manufactures that used buck converters inside the "cell" but they have fairly short lifespans, and efficiency loss due to the electronics. For a lot of cases, companies just abandoned the AA form factor and embedded a rechargeable battery.