Why isn’t the 80% charging limit coming to older iPhones?

Thank you again. This is interesting.

I checked with my EV builder friends and they made some observation. Packs can be imbalanced for years (to a point). No damage (they say).

In the old days rudimentary BMS stopped over voltage and under voltage. But for a long time we have had BMS that balance cells from the bottom of the charge curve.

My only real example of this (as I don’t have an analysis tool for my Tesla) is I have an old Vectrix maxi scooter which runs on 2011 Nissan Leaf salvaged cells to make up a pack.

The BMS balances from the conmencement of charging. As the cells charge, current bypasses higher voltage cells until all cells are the same and then they charge at the same current in unison.

There is quite a lot of confusion on this topic and it would be good to share an article if you can find one.

I have found academic papers which state that batteries cycled below 50% have a much longer life.

Regardless of those papers I am skeptical of the claim that Tesla’s recommended daily charge setting (which as you know is 50-80% SOC), unless travelling, will destroy their battery pack.

I obviously have a keen interest in seeing the evidence for this.

I found that forum.

https://teslamotorsclub.com/tmc/threads/charge-to-90-or-80-daily.194703/

I think you are confusing indicated range with battery health.

The two things can be quite separate.

An Interesting exchange in that forum and I will look at it in detail.

thank you for the explanation. Unfortunately, I can only say what I've been told, I'm not too familiar with the details. But it would be great if you could take a closer look and then give me feedback on what is the best for the battery. I think you're a bit more knowledgeable about this.

That’s absolutely wrong. The battery cuts off all charging after it reaches 100%? It can also cut it off when optimised charging is enabled? I’m pretty sure optimised charging came with a software update and not a hardware thing. So if they can cut it off, why can’t they do it at 80%

Because the hardware isn’t capable of it. Not all features become available to older hardware when a new device comes out.

I will definitely do that. We want these batteries to last and last (they do).

How do I claim for my refund

I need to know

Because Apple intends to let old phones battery age quickly so users can buy newer phones. They are a business, they does what makes them more money.