Who is this for really though? Any person installing roms is clued in and knows what they want. This “stable” author’s custom-rom credentials should be drop kicked into the sun.
They should at least make it easy to buy a genuine battery over that lifespan. Nobody should have to browse eBay & AliExpress for a replacement component that could theoretically explode.
Manufacturers should also be forced to promote battery recycling practices & initiatives too. They are tossing endless amounts of them onto rubbish piles via planned obsolescence and yearly updates.