Care to offer a justification for why this is the case without resorting to "the multi-trillion-dollar behemoth can't be bothered to build an app"?
As additional evidence, there are "AirPods-like" earbuds on the market such as the Sony WF-C700N, which have no problem reporting three battery levels over standard Bluetooth on e.g. Linux.
[0] https://www.bluetooth.com/wp-content/uploads/Files/Specifica...
The Bluetooth Battery Service spec allows for a single device with multiple batteries
On the subject of the multi-trillion-dollar behemoth, Apple is a private company. If you have the capital, you can acquire a controlling interest and then they’ll work on whatever you like. Until then, you’re out of luck.
No, it's not. The Bluetooth Battery Service spec allows for a single device with multiple batteries and individual battery reporting for each. [0] They even give the example in that doc of earbuds which are one “logical device” but two physically separate pieces, each with its own battery.
> On the subject of the multi-trillion-dollar behemoth, Apple is a private company.
Apple is, by definition, a public company.
> If you have the capital, you can acquire a controlling interest and then they’ll work on whatever you like. Until then, you’re out of luck.
No. Anticompetitive behavior such as tying (what I would argue is happening here) can and should always be subject to examination, criticism, and possible litigation by the public.
[0] https://www.bluetooth.com/wp-content/uploads/Files/Specifica...
Companies are not acts of God or nature. They are a private company operating on a society that allows it to exist because it is believed to be the for the public good. The public has very much the right to question it's practices, and if they are anti consumer, monopolistic, or a list of other things, to correct them. Shareholders be damned.
Like a lot of parts of the (especially earlier revisions of) Bluetooth spec the battery status took a slapdash approach to defining things. Look at anyone who's used Bluetooth on Windows to see what a nightmare interoperability still is. So Apple released ear buds that implement poorly defined parts of the spec but otherwise work with third party bluetooth devices, and that's bad?
Yikes.
Meanwhile, the Bluetooth SIG released an update at the end of 2022 that actually starts to require some sort of standardization. You know who's name was on that little update? Big bad awful anticompetitive Apple.
It's not uncommon (at least for me) to have a low earbud battery level (because I've just binged Slow Horses) or a low container battery (because I've just charged the earbuds from the container for the third time and drained the container). There's a suggestion above that you should "just choose the lowest one because 99% of the time that's what you're interested in", except that's not true in the second case.
I'm fairly sure that if you could report both, then Apple would report both using this hypothetical standard method, but since you can't, and there's no easy way to just "choose one" without misleading the user about something, they choose to do it properly, even though that means it's an Apple-only thing.