this post was submitted on 09 May 2026
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Mildly Infuriating

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macOS recently introduced the ability to limit your battery to only charge up to 80%, a feature that I personally appreciate as I'm mostly using my MacBook plugged into a dock and it's arguably a great way to limit the ageing of the unit.

There's just one huge problem. Well, two actually. Firstly it doesn't allow me to set a minimum charge ("start charging when battery is at X%"), so when it falls to 79% it just tops it back up to 80, not a big deal but slightly annoying. The much bigger issue is that the charge limit apparently isn't being saved to the battery firmware itself so when the MacBook is turned off and plugged into my dock it just keeps on charging to 100%...

Similar issue with my Pixel 9 Pro, it normally sticks to the charge limit quite well, but multiple times a month I'd say it just randomly charges to 100% regardless. Apparently that's to calibrate the battery or something? As far as I know you have to do a complete cycle to calibrate a battery which 80% to 100% isn't, also I don't think a Li-ion battery needs to be calibrated this often, does it?

To contrast, KDE Plasma retains the limit at all times, lets you set a minimum amount and actually tells the battery to always stop charging at that amount.

Am I just not getting something about this?

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[–] BorgDrone@feddit.nl 6 points 1 day ago (2 children)

MacBooks use practically no power when in standby. Turning it off actually uses more power than leaving it on (due to the time and processing power it takes to start everything back up).

Leaving it on also reduces wear on components. Being on all the time doesn’t cause a lot of wear, it’s switching between on and off that causes wear due to the component warming up and cooling down.

why would you just leave it on if you're not using it?

We’re talking a MacBook, not a desktop Windows machine. There is no benefit to turning it off and a lot of downsides.

[–] Blue_Morpho@lemmy.world 5 points 22 hours ago (1 children)

Practically no power isn't 0. It's up to 3watts. For comparison a Pixel 10 at 100% CPU is 6.5 watts.

[–] BorgDrone@feddit.nl -1 points 21 hours ago (1 children)

Oh no, 3 watts. How will I cope with the €0,00 that is going to cost me?

[–] Blue_Morpho@lemmy.world 1 points 20 hours ago (1 children)

I bet you throw your trash onto the street too. "It's just one plastic cup. One plastic cup doesn't matter."

[–] BorgDrone@feddit.nl 2 points 19 hours ago (1 children)

How is that in any way equivalent?

[–] Blue_Morpho@lemmy.world 2 points 13 hours ago (1 children)

You are throwing away 3 watts/hr because you can afford it while ignoring the tiny environmental damage it causes.

[–] BorgDrone@feddit.nl 0 points 13 hours ago (1 children)

What environmental damage?

I’ve got 5400Wp of solar panels and a 15kWh home battery. Excess solar power generated during the day is stored and used at night. With the exception of a few months in winter all my power is self generated using solar.

Even when I use grid power in winter I have a contract with the energy company for 100% renewable energy. In winter it doesn’t matter anyway since that 3 watt eventually ends up as heat which means my heating system needs to produce 3W less.

[–] Blue_Morpho@lemmy.world 2 points 11 hours ago (1 children)

That's really awesome. But your power setup is very unusual. Few have solar with full battery power storage.

[–] BorgDrone@feddit.nl 1 points 4 hours ago

Solar is very common, and I suspect battery storage to become really popular (at least in my country) in the coming years due to legislation changes.

[–] cerebralhawks@lemmy.dbzer0.com 8 points 1 day ago (2 children)

All of you are reading way too much into it. Turning a computer on and off doesn't hurt it. Leaving it on all the time doesn't hurt it either. A MacBook will last at least ten years if taken care of decently.

As far as the battery thing, mine's still at 100% output (not charge) after 2 years. I set the charge limit to 80% (OP is incorrect — macOS 26.4 didn't set the charge limit to 80%, it didn't set it to anything, it gave you the option to limit charge to 80, 85, 90, or 95% charge, or disable it if you've enabled it) and it's fine, I imagine it might last a few months longer, but I don't expect it to radically change the physics of Li-Ion battery degradation.

Batteries are still a consumable item. MacBook batteries are generally known for their reliability and longevity, though.

[–] Reverendender@sh.itjust.works 1 points 21 hours ago

It's very important for these internet people to be recognized as right by a group of anonymous strangers. Failing that, they very much need to make those strangers feel bad in the process.

[–] FireWire400@lemmy.world 2 points 1 day ago

OP is incorrect — macOS 26.4 didn't set the charge limit to 80%, it didn't set it to anything, it gave you the option to limit charge to 80, 85, 90, or 95% charge, or disable it if you've enabled it

You're right, I guess I still think calling something a feature implies that you can turn it off.