The beta battery health beast bites again

[walterpaisley]

I know this is often the case with OS betas, but I wanted to share that my battery health dropped from 92% before I started using the OS 27 betas to 88%. The thing I'm not sure is if the new number is a bug, was the actual battery health (but was displayed wrong previously) or if it reflects degradation caused by the betas. I'll file a bug report anyway, just in case.

Anyway, not a complaint, but people running the OS betas should be aware this can often happen.

 

[DHagan4755]

Have you seen if there was any difference using Coconut Battery?

 

[MikaNavigator]

Coconut Battery 4.3.3 on PB2 (26A5388g) won't help you in this matter.

 

[walterpaisley]

Have you seen if there was any difference using Coconut Battery?

It matches what the OS shows in System Information. Coconut Battery doesn't seem to work on the macOS 27 beta.

 

[DHagan4755]

Ok. I use Coconut battery from time to time. It sometimes shows me slightly different information than System Information (which feels more honest) but I haven't had enough data to determine whether it's anecdotal or not.

 

[SketchyClown]

I know this is often the case with OS betas, but I wanted to share that my battery health dropped from 92% before I started using the OS 27 betas to 88%. The thing I'm not sure is if the new number is a bug, was the actual battery health (but was displayed wrong previously) or if it reflects degradation caused by the betas. I'll file a bug report anyway, just in case.

Anyway, not a complaint, but people running the OS betas should be aware this can often happen.

You didn't say what Mac you are using and how old it is. Could be purely coincidental that the health dropped at the same time. Not unusual on machines a few years old to drop a few points. FWIW, I've been going since DB2 on my M4, and battery health was still 100% on Tahoe after 1 year, and still reporting 100% on DB4.

 

[Insleep]

Coconut Battery 4.3.3 on PB2 (26A5388g) won't help you in this matter.View attachment 2647298

The developer is working on updates for this; you can go to CoconutBattery settings in the menu bar and set the "update" option to "beta versions", and it should be fixed in the beta.

 

[benholt]

The 92→88 jump lines up with what usually happens at a major OS transition. Battery Health % isn't a straight coulomb count, it's a model that leans on cycle count, chemistry age, and coulomb-counter deltas — and beta installs pretty consistently re-seed those learned parameters. Whatever drift accumulated under 26 gets snapped back to the truer value in one step, so the new number is almost always closer to reality than the old one, not further from it.
Coconut Battery reads from the same IOKit surfaces as System Information, so once it's updated for 27 it'll report the same number, not a friendlier one. If you want to sanity-check without waiting for that update, System Settings > Battery > (i) shows the same cycle count and max capacity value directly.
To force a fresh calibration pass you can run the pack from 100 down to about 5%, plug back in, and let it sit at 100% for an hour or two before disconnecting. Not a magic fix — just a way to get the fuel gauge to re-anchor on clean endpoints.

 

[dumiku]

Mine dropped before the beta when I was on macOS 26, it drop from 92 -> 88 however Aldente is reporting it as 85.
After updating to the macOS 27 beta, it stayed the same.

I recently installed macOS 26 on another volume when I was doing some unrelated checking and macOS 26 was reporting my battery as 92 in the system setting but, macOS 27 was still showing 88, after I deleted the macOS 26 volume and reinstalled macOS 27 over the current install the battery percentage jumped back to 92 (now it is 91).

I think it was 92 when I remove macOS 26 volume and, when I reinstalled macOS 27 (not a clean install) it dropped to 91.
However Aldente still shows 84% battery life left.

I do not know if I should rely on apple reporting or third party software at this point but, trying to just keep my battery healthy for now.

I have 241 cycle count, I used my mac for like 1 week or 2 and during that time my I was draining the battery to 0 and charge back to 100%, during that time I used 10 cycle (May), from June to now, another 10 even though my mac is mostly plug since then.

I am not surprise with these number though.