Everything you are posting has been the same for every iPad, iPhone battery. I have tried all different things in regards to battery life, eventually just learned to use the device how it works for me, not worry about battery.
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All iPads Why do the new iPads use different battery?
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Some one here may want to check out this thread.
forums.macrumors.com
Extend M4 iPad Pro Battery Lifespan With This New Feature
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.
Extend M4 iPad Pro Battery Lifespan With This New Feature
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. When the 80% hard limit is enabled, the iPad will never charge beyond that...
forums.macrumors.com
Some one here may want to check out this thread.
Extend M4 iPad Pro Battery Lifespan With This New Feature
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.
Extend M4 iPad Pro Battery Lifespan With This New Feature
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. When the 80% hard limit is enabled, the iPad will never charge beyond that...
I've been using that with my new 13" Pro.
Honestly thought this was what your thread was about?Some one here may want to check out this thread.
Extend M4 iPad Pro Battery Lifespan With This New Feature
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.
Extend M4 iPad Pro Battery Lifespan With This New Feature
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. When the 80% hard limit is enabled, the iPad will never charge beyond that...
Yes some members wanted some information where this is all coming so they don’t think it is myth.
They had the same problem, it’s how batteries work.
Why Apple didn’t put this 80% feature before? I don’t know.
Yeah, Apple devices had that feature for a long time. Hard-limit is new, and available on all iPhone 15s and latest generation of iPad Airs and Pros.
I bought a 12.9 IPPin November, 2018. Everyday since then (until I bought a new 12.9 IPP a week or so ago)ot’s gone through at least one complete charge and refill. 2027 charge cycles. Battery would last ~11.3 hours. Battery life was at 100% health upon purchase. Now, 5 yrs and 7 months later, the battery health is at 78% and a full charge gets me -7 hours depending on what I am doing/
No complaints. It’s served extremely well for that period of time and the battery is as expected.
Tom
But if you follow the advice of not charging above 80% and not letting it fall below 20%, you've got 40% unusable battery capacity, so you're down to a 6 hour battery life TODAY. Life is too short to baby your battery.
If it’s plugged in most of the time, it’s not like you’d notice.
When I’m at the office, my 12.9” iPad is docked and connected to power anyway. I keep it between 70-80% like my laptop does by using iOS Shortcuts/Automations and Smart Plugs.
Where is the evidence. All EV battery makers tell car manufacturers to tell customers to only charge to 80%. It’s mostly a precaution as charging to 100% and letting the car sit for long periods of time isn’t great for the battery. Otherwise I have never seen any evidence or clear explanation of why charging to 100% is bad.
Only charging to 80% will result in a larger volume of charging cycles over x period, albeit shorter in duration. This may offset any benefit.
There has been plenty of studies done on LCO Li-ion cells, the same type used in iPhone and most other mobile phones. The evidence is clear. 80/20 is the most practical rule to achieve battery longevity.
Yes you can, with expected degradation in the battery. 100% to 0, every day since. Ovember, 2018 resulting in battery health of 78% but very heavy usage and still 7+ hours of use on a full charge. This iPad has definitely not been babied and has withstood 3 dogs and 4 cats.
But I’ve used this iPad every day for 5.5 years 👍😀, there is still life left in it It’s not yet ready to be retired to being a Plex server
Tom
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From your data, assuming initial capacity is 10 hours:
Charging 0 to 100%: Initial 10h. After 800 cycles (10h*0.82) = 8.2h, if we always fully drain the battery (unlikely).
Charging 20 to 80%: Initial 6h. After 800 cycles (6h*0.90) = 5.4h, assuming the battery meter is uniformly affected by the new capacity.
Sure, your battery health number is higher, but even your initial usable capacity of 6h is less than the degraded capacity doing a full cycle. It's simply not worth the bother.
The same data shows 40-100%, a far more common usage pattern, gives 89% rather than 90% health, so it seems it's best to just avoid draining your battery to 0, which we all do anyway. Preventing charging above 80 is only useful when you repeated fully drain the battery.
Charging 0 to 100%: Initial 10h. After 800 cycles (10h*0.82) = 8.2h, if we always fully drain the battery (unlikely).
Charging 20 to 80%: Initial 6h. After 800 cycles (6h*0.90) = 5.4h, assuming the battery meter is uniformly affected by the new capacity.
Sure, your battery health number is higher, but even your initial usable capacity of 6h is less than the degraded capacity doing a full cycle. It's simply not worth the bother.
The same data shows 40-100%, a far more common usage pattern, gives 89% rather than 90% health, so it seems it's best to just avoid draining your battery to 0, which we all do anyway. Preventing charging above 80 is only useful when you repeated fully drain the battery.
It seems to be new iPad Pro and new iPad Air as the OS is not allowing this feature for the older iPads and iPhones.
So if I don’t drain the my M4 iPad below 20% there is absolutely no reason to not to charge the iPad M4 to 100%? On the road 100% charging would sure be useful to me while traveling.
If I'm traveling, I always go with full 100% charge as that's the most likely time I'll need long battery time.
The only hard data we have is JPack's small chart a few posts up. It shows very little difference between 40-100 and 20-80. Whether 20-100 performs the same, we have no data, but yeah, it's likely fine.