As acknowledged within the title, my 2019 16-inch Macbook Professional has been self-discharging constantly ever since I up to date to macOS 10.15.8.
By constantly, I imply on a regular basis. It discharges when plugged-in (I’m utilizing the unique cable and charger that are in fine condition), and it additionally discharges whereas it’s fully turned off (not in sleep-mode, off). The laptop computer is pluggged-in more often than not I exploit it however I have to depend on its battery for work-related discipline actions.
I purchased this pc in 2020 and have fortunately been utilizing it ever since below Catalina (10.15.4 I imagine). I’ve carried out a clear set up at each Catalina “improve” simply to maintain issues as clear as potential. I’ve by no means wanted to replace to newer macOS variations as a result of I exploit it for work and have by no means had any use for the newer macOS variations. I largely do scientific computing on it (Mathematica, Python and LaTeX for paperwork); apart from that, I exploit the Mail, Messages and Facetime apps. I exploit web by Firefox, however it isn’t my major exercise on it.
I can not keep in mind the precise numbers, however previous to the ten.15.8 replace, battery capability was at 92%, with round 200 cycles. Ever because the replace (round a month in the past) I began noticing that the present cost was round 95% p.c each time I turned it on (after plugging it in).
Which means the pc is self-discharging whereas being fully off. Nevertheless, I used to be not alarmed about this at first as a result of I initially thought that I used to be maybe doing one thing unsuitable. Now I’m virtually certain that not solely the laptop computer is self-discharging itself on a regular basis, however it’s also dropping capability, virtually in real-time below my nostril.
I’ve put in “Coconut” simply yesterday after lastly realizing that one thing is unsuitable in spite of everything. The next 3 screen-shots span round 1 hour of use this morning. They illustrate that the pc is self-discharging whereas plugged-in. The final display screen reveals a 0.1% capability loss in lower than 24 hours.
I can not perceive how the battery misplaced lower than 10% in six years of intensive use and instantly greater than 5% in simply weeks. Is there a manner I can entry the battery utilization historical past to verify that the battery is self-discharging whereas fully off?
My guess is that the brand new firmware messed issues up (the present model on it’s Boot ROM Model: 2103.100.6.0.0 (iBridge: 23.16.14242.0.0,0)). Is there a technique to revert this firmware to a earlier one? (I’ve been informed {that a} clear set up of 10.15.7 wouldn’t downgrade the firmware).
EDIT
I forgot to say that this pc has all the time operated with out the battery well being administration possibility obtainable since 10.5.5.
