I've got a macbook. I don't use it much, and it sits on the side desk. Yesterday I charged it to 100% (which I had to click on a thing in the menu to allow; it only wanted to go to 80%) and then afterwards unplugged it and closed the lid. Today I've just opened it and it's at 1% charge. Do they not suspend properly or something? Surely it shouldn't use battery power while the lid is closed?
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hm, I have had a thought about this macbook battery thing.
If the lid is closed (so it's suspended), and I connect power to it, I believe it might wake up according to a stackoverflow post. This is fine, because it's connected to power. But if I then disconnect the power again, still without ever having opened the lid... surely the laptop goes back to sleep again? Is it not clever enough to do that? It surely doesn't stay awake with the lid shut until the battery runs down?
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I am updating this laptop to macos 15.2, to see if that fixes (a) battery things (b) activity monitor crashing with SIGILL now that I've run the bootup diagnostics once (c) after flushing nvram and SMC didn't help
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well, updating the OS has fixed Activity Monitor crashing on start, anyway, so that's presumably an improvement. Investigation continues.
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@sil If you haven't used it in a while, it probably tried to update the OS.
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@lrhodes I'm pretty sure it's not that; it does this always, not only this one time
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@sil Possibly a battery issue, then. Even if some process isn't suspending properly, you shouldn't be losing full charge overnight with the screen off.
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@lrhodes that's what I thought! there's a picture of the battery usage graph attached elsewhere in the thread. It claims that battery health is normal, though?
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@sil Screen On usage is zero, so it's not that. Have you looked at Activity Monitor yet? That should show you if some particular process ate up all of your battery life.
If you're on an Intel-based machine (look under About This Mac in the system menu), you can also try zapping the NVRAM: https://www.macworld.com/article/224955/how-to-reset-a-macs-nvram-pram-and-smc.html
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@lrhodes I have. Activity Monitor didn't show anything that was preventing sleep or similar. I then ran the bootup diagnostics (which claimed there was no problem) and now I've restarted, when I start Activity Monitor it immediately crashes with a bad instruction error, so that's not very helpful.
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@sil Hmm. The bad instruction error is interesting. I'd open Disk Utility and run First Aid to make sure there isn't a corrupt file or block causing both problems.
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@lrhodes no problems reported by First Aid in Disk Utility!
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@sil Hmm, I'm out of ideas, but this certainly seems similar to your problem: https://osxdaily.com/2021/10/20/why-macbook-draining-battery-sleeping/
Good luck!
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@lrhodes I'll have a look; thank you!
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@sil Absolutely not normal on the Apple Silicon Macs. I've had them last weeks while suspended.
Have you disabled power saving or similar?
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@awfulwoman no idea. I didn't disable that deliberately (since I have no idea how). I don't think this is an arm machine, though; it's not new enough for that. I can't see anything very obvious in the battery settings saying "be crap" which I've ticked
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@sil @awfulwoman this I’ve seen on my Intel MacBook Pro. I think either they do that when the battery gets old or their controller/driver gets silly with newer versions of the OS. It has rendered the machine quite unreliable 😒
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@supersole @sil 😭
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@supersole @awfulwoman ah so maybe it's just how it works then. It's not a huge deal; it will never leave this desk, and I don't need it a lot, so I can just plug it in when required. Bit disappointing, though.
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@sil it doesn’t drain in normal use - mine will last two weeks closed losing only a couple percent - but apps like PowerPoint or conferencing apps can prevent full power saving mode. That should show up in the energy usage history, though.
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@acdha hm, what's the energy usage history? I have a "battery level" graph (which shows a precipitous falloff after being charged) but nothing about which apps might be causing it.
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@sil @acdha Check Activity Monitor for anything eating processor, but it looks like your battery is fucked mate.
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@ross @acdha fair enough. I assume that the bit which says "battery health normal" is just full of lies and not to be relied upon?
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@sil @ross I treat that as a reliable positive indicator but an unreliable negative. You can see if the diagnostics turns up anything else but if there isn’t a sign of an app preventing sleep it’s the best theory:
https://support.apple.com/en-us/102550
pmset can display the log of assertions which prevent power saving:
https://ss64.com/mac/pmset.html
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@acdha @ross good thought; I'll try the diagnostics.
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@acdha @ross diagnostics say there's nothing wrong (as you predicted).
Amusingly, now I've restarted, Activity Monitor crashes when run with an illegal instruction. So that's helpful, not.
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@sil @ross @acdha try coconutBattery, it gives a much more reliable output and tells you the remaining capacity and cycles of your battery or you could have a look in the system report app
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@marius @ross @acdha that seems to think things are ok? Maybe I'm misreading it.
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@sil @ross @acdha ok-ish indeed. Definitely still intel but still supported even so I’m not surprised that it drains faster with current macOS. Try this next time: unplug it before shutting it down, otherwise it will just boot back up, drain the battery and go to a deep power save mode that you get greeted from with only a few % battery remaining months later. https://apple.stackexchange.com/questions/449084/macbook-pro-starts-automatically-when-charger-is-plugged-in
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@sil activity monitor had an energy tab which should show per-app usage.
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@sil If it's an old battery, and you're leaving it in sleep (not shut down) then this is normal behaviour when the battery can't hold charge anymore. Sleep does use some power and there ain't much in the battery. Shutting down properly will save it. My backup macbook (which is the only one that talks to the scanner) is like this.
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@pete fair enough. I am gathering from people's comments that the bit which says "battery health: normal" is just straight up not to be trusted and bears no resemblance to reality?
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@sil TBH I don't trust anything macOS says anymore...
If the macbook is old and battleworn then the battery will be fucked.
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@sil have you looked to see if it’s set to wake on network access, PowerNap in older versions (in Settings -> Battery -> Options)
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@rythie I have, and it’s set to “only on power adapter”
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@sil it’s supposed to be clever enough to suspend to disk and fully hibernate.
Do you have anything like “wake for network” or “Power Nap” enabled?
If not then maybe it’s a piggy app preventing sleep, or an SMC reset might help https://support.apple.com/en-us/102605
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@fodwyer I do not have those things. Activity Monitor now refuses to start because it crashes with SIGILL, but before when it worked it showed no application that was preventing sleep. I have reset both nvram and SMC and it hasn't helped.
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@sil have you been pointed to https://eclecticlight.co/2022/06/23/putting-the-insomniac-mac-to-sleep-help-is-at-hand/yet?
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@janl I hadn't, and thank you!
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@sil I have an Android tablet that loses power when it's plugged in, if you switch it on.
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@woo I had one of those. My problem was that I needed a 2A charger and I only had a 1A charger
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@sil Sadly (because I still have it), I think I was using the original charger.
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@sil To rule out some kind of quirk with the network waking it, try with it fully offline
Also see if it gets at all warm, recent Macs stay stone cold unless something fairly intensive is running (that might tell you whether battery really is supplying lots of power or numbers are misleading)
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@mattround I'll give that a try, but it's not all that recent a mac (it's an intel, for a start, from about 2019)
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