I can go along with you to not change out the battery quickly (like once it goes under 80%), but I can’t agree with not updating the iOS. I’m not sure how everything works but it seems like that would mean that you’re not doing security updates. Beyond that, I generally like the new features in the iOS updates. I think I’d rather figure out some functions that hurt the battery and shut them off if they’re things I can do without, rather than not update the iOS.
Of course! The vast majority of people think like you and agree with you. And there’s nothing wrong with that. You might be okay with updating even if you know that regardless of battery health battery life will suffer. And if you accept that, update until the device is unsupported.
But I will always take issue with recommendations. People have settled into a groove of replying to battery-concerned people who stay behind with “everything will be fine, just update and replace the battery”… and no.
It won’t be the same, having 100% battery health will not give you the same battery life I get with original iOS versions, and there’s nothing you can do, as Apple disallows downgrades. Once you update, you update forever. People recommend blindly updating with no regard to individual situations and blame everything on battery health (which is why I originally replied).
Maybe people can’t buy a device every two years, so they’ll suffer if you tell them to update their iPhone 11 or 6th-gen iPad from their original iOS versions. Some people even see this as the natural cycle of iOS devices: you buy them, you update them, battery life (and performance) suffer, and when it bothers you, you throw it away and buy new. Which is… okay I guess, but don’t make blind recommendations to update if you don’t know how they use them.
On iPads, it is even more difficult, so you have millions of iPads that are just gone because perhaps some people updated when they shouldn’t have, and theres nothing they can do.
So I prefer to go with the truth. You can expect anywhere from 40% to 60% of permanent and irreversible battery life loss, alongside moderate performance issues if you update far enough. Battery replacements will allow you to stay on that 40% loss, but nothing better (vs original versions). It’s your call. I like to give people as much information as I can when advising on an irreversible decision.
As far as battery replacements go, yeah, I think it has gone a bit too overboard, like I said. People aren’t even going to 80%, some even close to 90%, it’s beyond ridiculous.