So if ten car companies that cover 90% of the market of electric vehicles all don't allow you to install a third-party replacement battery, then this is fine because each is only one of many manufacturers. But if one company that has maybe 30% marketshare does this, this is a problem?
Sure lets go along with the car analogy, at present there is no third-party offering for an electronic vehicle replacement. Considering electronic vehicles have a battery replacement warranty for 8 years and most initial or early adopters leased those vehicles with a traditional lease term of 5 years, there is no way of knowing if those who did finance have required the battery to be replaced. Considering I have read the fine print on some electric vehicles where it states that after the warranty period usually 8 years, if the battery has no manufacturers defect and the owner who financed the vehicles does not want to trade the vehicle in can purchase a genuine battery from the manufacturer directly who can either have it installed by any dealership or opt to do it themselves. As the vehicle is over the 8 year warranty period purchasing a replacement battery and doing the install yourself would not void any warranty. The new replacement battery does carry the usually manufacturer warranty.
The present problem is that to replace a battery on previous generation electric vehicles were a PITA, it has gotten better as Tesla has the slide-in, slide-out battery option, I believe on the Model S 2017 and onward models. This was to address recharge and extend mileage options.
By contrast an iPhone after 2-3 years will require the battery to be replaced and very few if any would still be using an iPhone 8 years later with the original battery.
Manufacturers provide a warranty of 8 years on electric vehicles, while Apple only provides a 1 year warranty, with the exception of certain EU countries or if Apple gets sued and goes into damage control.
Do Electric car manufacturers offer genuine replacement car batteries after the 8 year warranty period is up, yes. Does Tesla, I am not sure maybe they do maybe they don't. I would find it hard to believe that after the warranty period they do not. Are there third-party manufacturers that offer a battery system to replace what electric car manufacturers offer, I don't believe so. The reason being is that it is still a relatively new market with low sales volume and most manufacturers offer a 8 year warranty on those batteries. Unless this becomes a lucrative third party market all depends on when electric vehicles outnumber ICE vehicles and those vehicles are past the 8 year warranty period.
In contrast smartphones have been sold for over a decade, there are many users with many generations still in use plus iPhones usually last for more than 3 years which has a lucrative resale market, however the biggest concern is battery life, as the warranty period is only a year and that is the component that deteriotates the fastest.
If Apple or other smartphone companies offered a 2-3 year standard warranty sans Apple Care where people have to pay extra things maybe comparable to electric vehicle battery warranty options. Apple and other smartphone manufacturers know that the battery is the first component to be replaced with regular usage and this is the reason why there is no financial incentive to improve its life past a certain recharge cycles, as it means they can sell you on additional warranty products, after the year if out of warranty they can charge you more or get you to upgrade to a new device.
It is all financial driven. Imagine purchasing a Tesla with a 1 year warranty on all components and the battery and spending that kind of money with the option to buy an additional warranty for 7 years for a total of 8. Would you purchase that vehicle? All warranties are built into the initial price of a product this is standard practise. This is what Apple does too, however by designing the battery to last only a year for warranty purposes they can charge you more as previously mentioned. One would not accept this type of practise from an electric car manufacturer.
Plus Apple does not sell components to customers directly, why is that. When batteries were not built into the device the user had the option to purchase more batteries and swap them, there was no concern of an Authorized Repair Shop. This problem is created by Apple to be self-serving. There was a period in Apple's history where this occurred in the 90's where Apple Computers did not use industrial standard components, that did not serve it well, it seems Apple is up to and reverting to its old methods.
Like you there were people who supported Apple and they poor decisions, who gladly paid a premium for the same if not worse performance at a higher cost. These same people convenience themselves and tried to insult others that they did not know any better, however Apple had to change to adopt industrial standards and those same people had to eat their own words, some still believed that Apple was making a big mistake. Without adopting industrial standards Apple would not be here today. However that mindset seems to have resurfaced which is rather concerning.
If Apple wants to argue better design with built-in batteries, that is fine however offer users the option to purchase genuine parts to conduct their own repairs. If Apple is concerned about the standard 1 year warranty, they can always provide the consumer the option to purchase the item after the warranty period has ended or void the warranty if the repair goes south. Most manufacturers know that the chance of any device to have a manufacturers defect in a year or less is remote to none, the problems start after that warranty period is up. I am sure if problems surfaced after 2 years we would see standard 2 year warranties.
And that would make it ok for them to block the installation of third-party batteries?
If Apple offered genuine components for sale to all customers at a reasonable and competitive price the third-party market would cease to be lucrative. If I can purchase an Apple battery for $30 and have it work well with my iPhone versus spending $20 on a third-party option that may cause problems, I will go with the $30 option. However what the battery replacement program has made transparent is that Apple overcharges an absurd amount for the battery and repair.
Rather than question third-party providers, one must ask why is Apple charging so much within their own warranty program, even with the "discount" Apple was not taking a loss on the hardware or repair, it was taking a cut on the gluttonous profit margin. You maybe okay giving your hard-earned income to a wealthy corporation for a repair, however the existence of many third-party repair outfits says the majority prefer to spend their hard-earned income on other things. If throwing away your income is of no concern to you, I have a 360 degree ocean view property on an iceberg for sale.

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That's a valid point that I did indeed miss.
I wonder what other software tricks Apple is using, i.e. reporting a faster degraded battery when it actuality it is not. Would be an interesting test for iFixIt or anyone else with the right equipment.
I bring this up as I have a 2014 MBP retina that I use everyday and recharge everyday and the battery health is at 85%, it is almost bordering to be replaced when it hits the 80-85% mark. If we consider recharge cycles, the size of the battery, etc an iPhone should really start to show signs to be replaced after 4-5 years. I am genuinely curious to see the results.
