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Just today, I bought an iPad stand for my 64GB iPad. I bought the AirDisplay app which lets you use your iPad as a second monitor, well third in my case. But I'm curious, is it "hard" on the battery or the iPad itself to leave the display on and plugged in for a large part of the day? Or is there no harm done?

asked Jul 05 '10 at 22:53

jkls240's gravatar image


In all Apple products, there is a battery saving feature. When your battery reaches 100%, the device stops the charging process, and let's the battery drain down to about 96%, then starts charging again and it repeats itself over and over again to prevent overcharging. I bet you didn't know that small little feature.

answered Jul 05 '10 at 23:22

AppleHack23's gravatar image


prevent overcharging? It's impossible (or at least VERY hard) to overcharge a device with a lithium ion battery.

(Jul 06 '10 at 00:01) Knunez Knunez's gravatar image

I'm pretty sure that's false AppleHack23..

(Jul 07 '10 at 01:04) jkls240 jkls240's gravatar image

Here's what Apple has to say about the iPad batteries and iPad battery care -- http://www.apple.com/batteries/ipad.html

To notable snippets from their recommendations (there are a lot more on the linked page) are:

Charge Cycles: A properly maintained iPad battery is designed to retain up to 80% of its original capacity at 1000 full charge and discharge cycles. You may choose to replace your battery when it no longer holds sufficient charge to meet your needs.

Use Your iPad Regularly: For proper reporting of the battery’s state of charge, be sure to go through at least one charge cycle per month (charging the battery to 100% and then completely running it down).

Charging Tips: The quickest way to charge your iPad is with the included 10W USB Power Adapter. iPad will also charge, although more slowly, when attached to a computer with a high-power USB port (many recent Mac computers) or with an iPhone Power Adapter. When attached to a computer via a standard USB port (most PCs or older Mac computers) iPad will charge, but only when it's in sleep mode. Make sure your computer is on while charging iPad via USB. If iPad is connected to a computer that’s turned off or is in sleep or standby mode, the iPad battery will continue to drain.

answered Jul 06 '10 at 00:07

ageekmom's gravatar image

ageekmom ♦

Does Apple's battery advice for notebooks apply to non-Apple notebooks as well?

(Jul 07 '10 at 10:21) bradto bradto's gravatar image

I think it's a good start -- lithium ion batteries are pretty standard across all portable computing devices.

(Jul 08 '10 at 02:45) ageekmom ♦ ageekmom's gravatar image

No, I sometimes have my iPhone on for hours at a time watching a movie/TV and all is good.

answered Jul 05 '10 at 22:55

Knunez's gravatar image



And considering the iPad's battery is bigger and there's 2 of 'em, it should be even better.

(Jul 05 '10 at 22:57) Knunez Knunez's gravatar image

i agree i leave my ipod touch on for hours on ent and i did so the other day for 4hrs and it works perfect lol :)

answered Jul 07 '10 at 10:14

xXTheGAm3rXx's gravatar image


it has never ever been a problem for me as i have charged by battery on my ipod touch 2g before for 5hrs on end and nothing is wrong with it lol :)

answered Jul 07 '10 at 10:15

xXTheGAm3rXx's gravatar image


Leaving any device plugged in that has a charge unit will not hurt it in the short term. However, it is a good idea to let the batter run almost to empty at least once a month, otherwise you are reducing the charge capacity of the battery over time. This is true for all electric units with a chargeable battery.

So, do what you want with your computer, just make sure you run it down once a month, make the battery feel needed, to keep your battery and your computer happy.

answered Jul 08 '10 at 02:28

Eric%20Fox's gravatar image

Eric Fox

There should just be one post on this, but there are multiples. Letting it drain, then plugging it in to fully charge is the best practice for making your battery live the longest it possibly can.

answered Jul 08 '10 at 15:05

alexleiphart's gravatar image


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Asked: Jul 05 '10 at 22:53

Seen: 24,706 times

Last updated: Jul 08 '10 at 15:05