Making more reliable batteries is a good step, but what about the phone itself? What about all the phones out there that seem to go to shit and slow to a crawl after a year or two? I know it's not simply a case of user error when I've personally factory reset a few phones, only to have them exhibit the same behavior afterwards with a clean slate. Planned obsolescence is a real thing, hell it was even in my history books back when I was in high school over 10 years ago... Until manufacturers start building to last rather than building to fail, this issue will always exist.