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Apple's new M4 iPad Pro and M2 iPad Air models feature a battery health setting that is new to iPads and when enabled prevents the devices from charging beyond 80% at all times, which can extend battery lifespan.

m4-iPad-Pro-Horizontal-Feature-Purple-Triad.jpg

When the 80% hard limit is enabled, the iPad will never charge beyond that percentage, except on rare occasions to "maintain accurate battery state-of-charge estimates," according to Apple. Apple says reducing the time that a battery is fully charged can reduce the wear on the battery and improve its lifespan.

From Apple's support document:
Reducing the time that your iPad spends fully charged reduces the wear on your battery. With iPad Pro (M4) and iPad Air (M2), you can choose to limit charging at 80 percent, which can help prolong your battery's lifespan. When you choose 80% Limit, your iPad will charge up to about 80 percent and then stop charging. If the battery charge level gets down to 75 percent, charging will resume until your battery charge level reaches about 80 percent again.
How to Set an 80% iPad Battery Charge Limit

  1. Open the Settings app on your M4 iPad Pro or M2 iPad Air.
  2. Tap Battery ➝ Battery Health.
    Tap the switch next to 80% Limit to turn on the feature.
battery-charge-limit-ipad.jpeg
Note that from the new Battery Health settings menu you can also view the manufacture date of your iPad's battery, as well as the month and year on which it was first used.

On M4 iPad Pro and M2 iPad Air models, you can also find out the cycle count of your device's battery. To learn why this matters, be sure to check out our dedicated how-to article.

Article Link: Extend M4 iPad Pro Battery Lifespan With This New Feature
 

pksv

macrumors member
Mar 12, 2024
92
147
So you are saying that in order for my phone or iPad to last longer I can only have 4/5 of the battery life every single day??

I don't know if having the device last longer is worth losing 20% of the length of how long I can use it before it dies every day...seems like a bad idea to me
Not only that, but you also shouldn't go below 20% (that's what they recommend) so effectively you have 3/5 of the advertised battery life.
 

CJM

macrumors 68000
May 7, 2005
1,541
1,062
U.K.
Why not make batteries that have an extra 20% we never "see". So 100% is basically 80%.
A car manufacturer has tried that. Can’t remember which one but I saw it on a YouTube recently. They didn’t make it public that was what they’d done though. It was worked out by the rated kWh and when it finished charging. With undisclosed features like this, I can see people being mad about it.
 
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CJM

macrumors 68000
May 7, 2005
1,541
1,062
U.K.
Not only that, but you also shouldn't go below 20% (that's what they recommend) so effectively you have 3/5 of the advertised battery life.
Just like EVs. Depending on battery chemistry. It’s fine for day to day, but with a phone, unless the efficiency is awesome you might find yourself needing to charge.
 
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kiranmk2

macrumors 68000
Oct 4, 2008
1,550
2,058
So you are saying that in order for my phone or iPad to last longer I can only have 4/5 of the battery life every single day??

I don't know if having the device last longer is worth losing 20% of the length of how long I can use it before it dies every day...seems like a bad idea to me
This option means that should a day come when you need to charge to 100% (for example you will be travelling) the battery still has the health to do it. Without this feature* the battery might have degraded to 90% health after a year or so of heavy use so getting the full "100%" battery life would be impossible.

*I've heard that Apple actually used batteries with more robust health in the iPhone 15 range so this could also help sustain battery health even without using the feature.

I'd love a way to set the charging limit myself (e.g. a hard limit of 90%), but this is better than nothing.
 

MTShipp

macrumors 6502a
Mar 25, 2009
855
227
Raleigh, North Carolina
I think the individual will be making their decision to use this based somewhat on how long they keep their iPad.

The “lifers” that hold onto their iPad for many, many years would certainly benefit from this.

Those of us (myself included) that buy the lastest model every release cycle or, at most, every two cycles, may not enable this feature knowing they probably would not tax the battery health near 80% of it’s lifespan.

My current usage is to charge overnight, use all day, and unless I get a 10% warning, I just plug it in when I go to bed. Else I plug it in for 30 minutes or so and go back to using it until bedtime.
 

Shifts

macrumors regular
Oct 3, 2019
150
139
New feature? Isn't this an old feature already present in iOS?

However, I would like to have this on macOS, iOS, iPadOS for the units I already own. Having the units docked until I need them without having to worry about any charge cycles would be lovely.
 
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Nezben

macrumors newbie
Jul 19, 2012
18
0
Biggest waste of time/battery power.

I used this feature with my new Iphone 15 PM from day one and after 3 months was already down to 97% after 35 cycles!
Got an iPhone SE through work over a year ago and charged it as and when needed to 100% and it still shows 100% capacity.
 

Apple Mac Daz

macrumors 68030
Jun 2, 2011
2,962
3,125
Manchester
Biggest waste of time/battery power.

I used this feature with my new Iphone 15 PM from day one and after 3 months was already down to 97% after 35 cycles!
Got an iPhone SE through work over a year ago and charged it as and when needed to 100% and it still shows 100% capacity.
Wow my 15PM is on 104 cycles and still on 100% and never had battery enabled
 

McWetty

macrumors regular
Oct 7, 2011
246
1,129
Been using this on my 15Pro. I’d say it’s ok if you charge during the day, but not great otherwise. I plug into CarPlay so that gives me a bump charge mid day. But if I don’t drive that day, I’m at 20% before dinner. Not ideal. I’m still trying to decide if I like the feature, or if I’m just going to get a battery replacement in 2 years.
 

Nclaire44

macrumors newbie
Jul 29, 2023
7
17
We need this for the Mac: Automatic, off and 80% charge limit. The current automatic setting works surprisingly badly compared to iOS.
 
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Houpla

macrumors member
Jan 1, 2018
69
82
Not only that, but you also shouldn't go below 20% (that's what they recommend) so effectively you have 3/5 of the advertised battery life.
No, youcan extend battery life by using 3/5 of its capacity. When you need full capacity, you can of course charge to 100% and drain to 0%. But most of the time it's not needed.
 
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