[Feature Request] Battery Percentage

[DrJedikiah]

I noticed that battery percentage on similar apps are not precise, it's always like 50% 60% not like 58% incrementing by 10.

At first I thought it might be something related to AWDL hardware but my mac os installed laptop which has an intel bluetooth shows the exact precise battery percentage, so it's completely about software.

Do you have any idea how macOS or iOS gathers exact battery info?

[SpriteOvO]

Because the unencrypted part of the BLE advertisement packet broadcast by AirPods seems to contain only battery values in steps of 10% (only 4 bits).

AirPodsDesktop/Source/Core/AppleCP.h

Lines 144 to 146 in 5a9c8d6

	uint8_t curr : 4; // Battery remaining [0, 10], otherwise unavailable
	uint8_t anot : 4; // Battery remaining [0, 10], otherwise unavailable
	uint8_t caseBox : 4; // Battery remaining [0, 10], otherwise unavailable

As for the units digit, some people think it is faked by iOS or macOS, and I think it is also possible that it is contained in the encrypted part (if it is not a hash), or communicated in some other way.

In the future, I'll try to start a timer when the AirPods battery value changes for the first time and also do a fake units digit value with time, I want it to change in 1% steps, but if it doesn't work well, I might make it change in 5% steps.

If anyone has a better idea or would like to contribute, please feel free to comment here or open a PR.

[DrJedikiah]

I can ensure you it's not faked. Maybe reversing macOS' IOBluetoothFamily would help but I'm not that familiar with macOS.

[SpriteOvO]

I'm also not familiar with macOS, and I've never even used it, so I have no idea about the reverse of that system :/

[UltimateTanA]

Yes even i think if you can make the battery info more precise by making the increments of 5 or even 1 if possible
that'd be really nice