Questions tagged [battery]

Concerning devices that store electrical power which can be used to run various devices in the absence of external power.

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17 views

Why sometimes the charger for iPad Pro cannot charge for Macbook Pro

Why sometimes the charger for iPad Pro cannot charge for Macbook Pro. I use the charger for iPad Pro to charge Macbook Pro, sometimes it can be used to charge the Macbook Pro while sometimes it cannot ...
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Menu bar and Battery preference pane display different battery percentages on Big Sur

Why does my Mac display different battery percentages in the menu bar and in System Preferences > Battery? Maybe this has to do with battery optimization, like mentioned in this question, but why ...
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Show Battery percentage on Mac OS Big Sur

After I upgraded my mac to big sur the battery on the menu bar only show bar/not percentage like before. How to show percentage again? I go to battery preference but no that option.
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Problems after switching from MacBook Pro 13“ Mid 2018 to MacBook Pro 16” Late 2019

Today I've got my new MacBook Pro 16" Late 2019. It will replace my "old" MacBook Pro 13" mid-2018. I've set it up as a new MacBook and just copied over some files. I now have a ...
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2answers
988 views

How many lithium-ion batteries does a M1 MacBook Air (2020) have?

I would like to ship a MacBook Air (M1 model released in 2020) from Japan to South Korea via EMS, but the EMS website says it is not possible to send a machine that has more than 2 lithium-ion ...
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Battery performance on iPad in sidecar mode

I'm thinking of getting an iPad as a second display using the sidecar feature. Assuming the display be always on in sidecar mode and it's always plugged in to charge, would the iPad using its battery ...
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1answer
29 views

Where does the pmset CPU_Speed_Limit variable come from, and how to modify it

The man page of pmset states: pmset must be run as root in order to modify any settings. Yet I cannot find out how to alter the CPU_Speed_Limit variable. I'm not a registered Apple developer, but I ...
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1answer
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Big Sur: I'm not able to charge up to over 8%

I know about this question, but this is a feature for when your battery is about 80% not 8%. My Mac is MacBook Pro 15-inch 2019 and since the update to Big Sur, my mac won't charge fully to 100% while ...
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Macbook Air Early-2015 Service Recommended Warning [duplicate]

I have a Macbook Air Early-2015 model since 2017. Like 4 or 5 months ago, I updated from High Sierra to Mojave. Initially there was no problem. But after a few weeks my Macbook started to shutdown ...
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Can I tell my Mac to charge to 80% only?

I leave my MacBook plugged in for days at a time, so the battery stays charged to 100%. Despite Apple claims to the contrary, I believe that the battery's capacity would be better preserved if I could ...
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MacBook Pro 16-inch with Big Sur does not charge Apple Watch with lid closed

This problem is literally ungoogleable because everyone is talking about how they're MacBook Pro isn't charging because of the new battery health management. But my problem is different - I used to ...
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Apple Watch Fading to Black on Startup

I just bought a cracked Apple Watch to try and repair. When I put the watch on the charger, it turns on the Apple logo for a couple seconds then fades to black. When I remove the watch from the ...
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1answer
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How can I read the battery level of a MacBook in Swift?

I have seen many post here/on SO and many docs on Apple's website about reading the battery level on iOS, but what's the best way to do this on a MacBook? In the past the only way I've found to do ...
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2017 macbook pro shutting down [duplicate]

My 2017 13inch MacBook pro is randomly shutting down. The battery is 82% or higher. when I try to turn it back on I get a screen with a battery that looks like it needs charging. I have to connect ...
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Macbook Pro says it’s charging but isn’t, both when plugged in and not plugged in

I plugged my macbook in when it was on 10% and noticed it said not charging, so I unplugged to try a different cable but noticed when it was unplugged it still had the battery with the charging icon, ...
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2answers
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Macbook resetting itself when playing a game

I have a problem with my MacBook Air 2017 and I need help. I was playing Heart of Iron 4 on my Macbook Air and all of sudden, my Macbook Air restarted itself. I restarted it and now I have this ...
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Why My MacBook Pro’s battery is swollen and it don’t turn on nor charge? It’s 13 inch early 2015 [duplicate]

My MacBook Pro’s battery is swollen and it don’t turn on nor charge? It’s 13 inch early 2015. I found my MacBook dead suddenly . Later I opened it up but found that the battery is swollen and after ...
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Different hibernate modes on MacBook Pro?

Sorry if this question will appear to be stupid. Is it possible to set one hibernate mode (for example 3) when macbook is on power adapter and another hibernate mode (25) when it’s on battery. Is it ...
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Mac Pro 3,1 Power Up No Chime Nor Boot

My Early 2008 Mac Pro won't boot. Won't do much, actually. This is what I've done: replaced the power supply removed DVD player removed all RAM removed all video cards (I have a handful of ...
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2answers
146 views

Apple Macbook SERVICE BATTERY status and where is it stored

I know for a fact that Service Battery status is stored in macOS files somewhere but not sure where. Reinstalling Macbook removes this status. Running Macbook from external OSX removes this status. ...
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1answer
49 views

Battery Consumption too high

I’ve noticed in the last couple of days that the battery of my iPhone XR is not lasting as long as it used to, its maximum capacity is 90%. In the last 2 hours I’ve lost 80% of my charge only watching ...
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23 views

My iPad mini charges but doesn't turn on [duplicate]

My iPad mini turned off and said it has no charge, then after 1 hour of charging I plugged it into a different port and then it turned on with 100% battery. Later, the 100% went down quickly to 20% ...
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MacBook Pro Screen Goes Black,Then Red Battery Indicator Shows When Battery is Charged

Am having an intermittent problem. My MacBook Pro screen goes black, red battery indicator then comes on but the battery is charged to at least 50%. Soon as I plug it in, this goes off. Initially ...
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1answer
29 views

Slow and laggy Macbook Air 13" mid-2012 (A1466)

I've had it since it first came out and they're finally starting to give way. Maybe it's because I was rough with them, but I hoped they last me a little longer (or at least until after university). I ...
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How to check battery capacity of a new phone (iPhone SE)?

So I just bought an iPhone SE in an unofficial store (new packaging and everything, warranty, etc.). The only problem with the phone is, the battery life seems super short to me. In settings -> ...
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Macbook Pro think 60W adapter is a 12W one, and won't charge anymore

When charging my Macbook Pro (13 inch, mid 2017, MacOS Catalina 10.15.7) with the 61W USB-C Power Adapter from Apple, sometimes the "battery is not charging" warning start appearing from ...
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1answer
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External Sonnet 550 eGPU not providing enough power for MacBook Pro (15-inch, 2018)

I have an external Sonnet box https://www.sonnetstore.com/products/egfx-breakaway-box-550, and it is not charging my notebook fast enough, e.g battery still draining when the MacBook screen is open. ...
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1answer
20 views

MacBook Pro 13 will not recognize battery and will not charge after battery replacement

Did not start my MacBook Pro 13 for 5 weeks. when I tried it was completely dead and would not start up even with charger on it. I ordered a new battery and now it works when pugged into charger but ...
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33 views

How do I bypass the battery using command keys on MacBook Pro 2017

How do I bypass the battery using command keys on MacBook Pro 2017 which has a non-removable battery to run only on power cable?
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Stop 'Battery 100% Charged' notifications

I have a MBP 2018. After upgrading to Catalina, when unattended with the power adapter connected, after a while the machine will start chiming every ten seconds and displaying a '100% Charged' message ...
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108 views

Will using higher wattage chargers degrade iPhone battery more quickly?

I’ve been using an 8+ for exactly 3 years and have been using the usb 5W wall charger that came with the box. I’ve never used any other charger, and has always charged by phone with 5V/1A. However, ...
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How can I stop Time Machine from backing up on battery when “Backup while on battery power” is UNCHECKED?

Hopefully the title explains everything. I just noticed that Time Machine is currently backing up, although the preference to "Backup while on battery power" is clearly unchecked. How can I ...
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How to prevent the battery capacity degrading using a PowerBook G4 with Ubuntu 16.04?

I have a 2005 PowerBook G4 which I dual-boot Mac OSX 10.5.8 and Ubuntu 16.04 XFCE. The 'book runs both OSs quite well but I have noticed that using Ubuntu has the effect of reducing the battery ...
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1answer
32 views

Is there a way to bypass charge a 2019 MacBook Pro?

Bypass charging powers the computer but it doesn't charge nor discharge the battery. Can I bypass charge on a 2019 MacBook Pro?
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Can MacBook Air (2020) be charged from airplane USB?

I read somewhere that the new MacBook Air computers (the ones with USB-C) can be charged slowly from any USB source using a USB-C to USB-A adapter. I'd imagine that a plane USB port delivers 5W or 10W ...
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1answer
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Macbook Air 2019 will not boot from USB or complete Internet Recovery, Exhausted options

Internet Recovery fails. USB Boot fails. Target mode won't mount. Macbook Air 2019 TrueTone, ran before I deleted the SSD (stupid). Battery shot, requires power supply to run. Tried Internet Recovery ...
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How to tell when Magic Keyboard or Trackpad are charging from bash

So I just registered and have not enough Kharma to comment on the original post (but I can ask a new question and this makes no sense to me; go figure), but I got this excellent script from Will Cain ...
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1answer
107 views

Apple Health draining battery following iOS 14 update

Since updating to iOS 14 (now 14.0.1) Health is draining my battery even though I don't use it much. For example, just one minute of use results in 37% of battery use and I need to recharge 2-4 ...
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Macbook air 2012, installed new battery, bottom of trackpad sounds loose/clicky now, ideas?

My other one couldn't hold a charge well but didn't look bloated at all to have warped anything in my system. All that was weird that happened was that I lost one of the bottom case screws (small ones)...
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Charging Macbook Pro with lower wattage from display is bad for battery health?

I have a 16" MBP and a external display with thunderbolt 3 capabilities. The display can charge devices with 85w, but the MBP needs 97ish. The question here is: is it bad for the battery to ...
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3answers
3k views

“Battery is not charging” after updating to MacOS Big Sur

I just upgraded my MacBook Pro to MacOS Big Sur Version 11.0 Beta, and my battery, even though the power adapted is connected, is showing the message "Battery is not charging", while ...
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87 views

WhatsApp Battery Drain on iOS

Last night my iPhone XR battery completely drained over the course of 4 hours. It was due to WhatsApp Background activity, as shown in the animated gif below. (Click to view). I've used WhatsApp for ...
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0answers
37 views

macOS 10.15.6, is there a way to get an early low battery warning?

I usually only get the low battery warning when I'm at 1% or so. How do I make it so the notification pops up at 5%, 10%, 20%, etc. Preferably all of those.
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1answer
31 views

Besides the main battery, do any components inside MacBooks rely on any other batteries to operate?

Besides the main battery used to power Apple notebooks, do current MacBooks have any other built-in non-rechargeable batteries that may need to be replaced after a certain period of time? I was ...
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1answer
87 views

High kernel_task CPU usage

I have a 2019 15" MBP which has had a string of issues, but is passing all hardware tests when serviced at the Genius Bar: November 2019–March 2020 Mac freezes daily, usually towards the end of ...
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1answer
122 views

How To Handle Power Outages With Remote Macs?

At my condo, which I visit monthly, I have a 2010 MBA (High Sierra?) that runs a webcam and performs various other periodic tasks. I don't have an UPS for it, but the internal battery usually lasts ...
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31 views

CMOS Battery or similar for iPhone Location

I have an iPhone 7. I want to know where the CMOS Battery or similar to CMOS Battery for iPhone. Please let me know where it is by showing a diagram if there is one. If you cannot show me, let me know ...
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1answer
36 views

used iphone 8 plus charged battery drain

I have bought an used iphone 8 plus yesterday. It s working all right after some testing, before I I got to sleep, I charged it 100%, when I woke up today I found it 80%. I find it completely not ...
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2answers
272 views

What does this statement about saving battery power on iOS mean?

While reading the iOS 14 guide by Apple here, on page 78, In the Quit and reopen an app section What does the highlighted statement mean? Is it that on iOS, the apps don’t close(terminate processes ...
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1answer
95 views

Preserving an iPhone in factory state for long term

I have an iPhone 5 that's still running factory installed iOS 6. I want to preserve it long term for the future; possibly over the next 10 years, or more. How can I best preserve the iPhone so it will ...

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