Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

Orangeman13

macrumors 6502a
Original poster
I just bought an iPad Pro M5/13 inch. I really like it but would it harm the battery if I used it for hours plugged in and the charging limit set to 80%? I bought the 6ft. cable and it reaches me very easily, making it convenient to use while charging 🙂
 
I have an M4 iPad Pro 11" at 100% battery health and over 120 charge cycles. This one is kept by my bedside and used for reading before I go to sleep, so usually off charger for multiple days.

I also have an M4 iPad Pro 13" at 98% battery health and only 48 charge cycles. This one I use as a laptop and keep it plugged in while using most of the time.

That's anecdotal, but it does seem to me that using it always plugged in does cause premature aging of the battery (or it could be entirely a coincidence since not all batteries are created equal). But premature aging isn't a real issue if you don't need it to have much of a battery life because you will always use it plugged in. You will still probably need to replace the battery at 80% health to avoid performance throttling, I guess.

Also keep in mind that even with the charge limit, it won't stay at 80%. It occasionally will charge to 100% and batteries do not like being left at 100% all the time. That's probably what caused my 2% loss over time. Maybe you can keep a better eye on yours than I do and discharge it occasionally to get it back in that 20-80% zone.
 
I keep mine at 80% charged 24 hours a day and thus far no issues with it. My previous iPad prior to this one was on the charger 80% as well for over two years.
 

Attachments

  • IMG_0242.jpeg
    IMG_0242.jpeg
    2.3 MB · Views: 86
Modern chargers regulate the charging speed to prevent overcharging, typically before reaching 100% capacity. This regulation is achieved through communication between the charger and the device (e.g., iPad).
The operating system employs a slight trick to manage charging. When the battery level drops to 99.9% during heavy usage, the system does not send a charging signal. However, it continues to display the battery level as 100%.
The exact limit is not entirely clear for me, but it is likely to be around 97%. This prevents the battery from being fully charged at all times.
Therefore, do not be concerned; always keep it charged.
In essence, I am referring with 100% to the complete utilization of your remaining capacity. The same is true if you set for 80% limit. By the way, iPhone, iPad, and MacBook should still retain 80% of their original capacity after 1000 full cycles. Batteries for solar panels nowadays can endure up to 10,000 cycles.
 
Last edited:
Modern chargers regulate the charging speed to prevent overcharging, typically before reaching 100% capacity. This regulation is achieved through communication between the charger and the device (e.g., iPad).
The operating system employs a slight trick to manage charging. When the battery level drops to 99.9% during heavy usage, the system does not send a charging signal. However, it continues to display the battery level as 100%.
The exact limit is not entirely clear for me, but it is likely to be around 97%. This prevents the battery from being fully charged at all times.
Therefore, do not be concerned; always keep it charged.
In essence, I am referring with 100% to the complete utilization of your remaining capacity. The same is true if you set for 80% limit. By the way, iPhone, iPad, and MacBook should still retain 80% of their original capacity after 1000 full cycles. Batteries for solar panels nowadays can endure up to 10,000 cycles.
Lithium batteries don't like very high or very low voltage for prolonged periods. 97% is still pretty high voltage. So it will degrade the battery faster than 80%.
80% of their original capacity after 1000 full cycles is a broad average.
I have seen batteries under 80% health after 150 cycles because of bad usage (mainly the iPad left dead for long periods)
And iPads with over 90% after close to 1000 cycles (I have one) because of the healthty way the battery was cycled/used.
 
  • Like
Reactions: HouseLannister
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.