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should I leave my macbook pro on charge all the...

will it shorten the life of my battery if I leave it on charge all the time?

You shouldn't do that. The best way is to use the laptop till the battery drains - charge it - use again. Well, that's how I use mine.

The Macbook battery is helped by the trickle charge system.   Once it reaches maximum it is self servicing insofar as it trickle charges to maintain its full charge level.    If left on and used fairly regularly, say daily, it will do no harm to keep it plugged in.    If you don't use it too often, then it is not advisable

ros60 wrote:

 

will it shorten the life of my battery if I leave it on charge all the time?

 

Yes.

 

https://www.apple.com/batteries/

Since the OSX controls the charging, it really does not matter how long you keep it connected to AC.  The battery cannot be overcharged.

 

What is important that the MBP should be used under battery power at least once per month to about the 40% charge level before recharging it.  Lithium ion batteries require periodic 'exercise' in order to maximize  battery life.

 

Ciao.

I've seen varying and contradictory answers and opinions to this question for years. Occasionally someone will give an authoritative-sounding answer, but then will provide no reasoning or references to back it up. Saying "Yes" or "No" and then linking to Apple's general battery documentation is not enough. I've read through all of the (sparse) documentation and, from what I can tell, leaving your laptop plugged in will not harm the battery. In fact, it may actually increase the lifespan over letting it discharge and recharge. I'll share my reasoning and maybe someone with actual facts can corroborate or contradict me.

 

According to Apple's Why Lithium Ion? document, Li-ion batteries have a limited number of recharging cycles, which we all already know. One charge cycle is spent when an amount equal to 100% of the battery's capacity has been discharged, but not necessarily at one time. For instance, if you use 75% of your battery one day, re-charge to 100% overnight, and then use 25% the next day - that's one full cycle. The more cycles you use over time, the lower your battery's capacity gets.

 

But that's as far as the documentation goes, so I have to make some assumptions here. Is the battery bypassed when it hits 100% and the charger is still plugged in? I don't have the specs, but that would seem reasonable. If this is the case, then if the battery drops to 99% while plugged in, it would trigger "trickle charging" (see Why Lithium Ion?) until the battery hits 100% again. But a battery that's being bypassed (especially a newer one) should take a long while to lose enough charge to trigger trickle charging. So you might experience a few ~1% discharge and recharge cycles, but they should be few.


So, if all this is true then it stands to reason that leaving your Macbook plugged in should significantly reduce the time it takes it to complete a full charge cycle, which should increase your battery's life.

programmist wrote:

 

But that's as far as the documentation goes, so I have to make some assumptions here. Is the battery bypassed when it hits 100% and the charger is still plugged in? I don't have the specs, but that would seem reasonable. If this is the case, then if the battery drops to 99% while plugged in, it would trigger "trickle charging" (see Why Lithium Ion?) until the battery hits 100% again. But a battery that's being bypassed (especially a newer one) should take a long while to lose enough charge to trigger trickle charging. So you might experience a few ~1% discharge and recharge cycles, but they should be few.


The highlited statement is the flaw in your argument.  When the battery is charged to 100%, the AC adapter will power the MBP but will not charge the battery until the charge level drops below 95%.  (That can take a fairly long period of time).  Then it will commence to recharge the battery to 100% and repeat this cycle until it is interrupted by removing the charger. 

 

If you want to review authoritative information regarding lithium ion batteries, go to the Battery University web site.

 

Ciao.

Yes I was going to write similarly.   Here is the Battery University link.   There are others in Google.

 

https://batteryuniversity.com/learn/article/charging_lithium_ion_batteries

seventy one wrote:

 

Yes I was going to write similarly.   Here is the Battery University link.   There are others in Google.

 

https://batteryuniversity.com/learn/article/charging_lithium_ion_batteries

That is because you have a brilliant mind. 

 

Ciao.

Ah yes, great minds think alike ... and so on.

Thanks for your response, but whether it's 99% or 95%, the argument stands due to the time it takes for a bypassed battery to discharge enough to trigger charging. Whether that happens at -1% or -5% is unimportant. The point is that it takes a long time to expend a full 100% charge cycle while plugged in, which should (in theory) extend the battery's life.

 

Thanks for the link though. I'll check it out.

I think both of those articles leave room for interpretation and are far from an outright statement that a MacBook Pro being on the charger 100% is a bad idea.

 

From my experience with many MacBook Pros leaving them on the charger for 90-95% of the time has no detrimental effect on the battery.

Duane wrote:

 

From my experience with many MacBook Pros leaving them on the charger for 90-95% of the time has no detrimental effect on the battery.

That may depend what is done during the 5% - !0% periods when they are not connected to the charger.  It may also depend on how you define detrimental. 

 

Ciao.

OGELTHORPE wrote:

...

That may depend what is done during the 5% - !0% periods when they are not connected to the charger.  It may also depend on how you define detrimental. 

 

Ciao.

Doing the same thing I do when it is connected to the charger. Detrimental as in loss of battery longevity.

As you can see that my macbook pro 13'(retina mid 2015) is plugged in and its 100% charged. Now it's 'Charging : NO' and 'Fully Charged : YES'. So it's using the power source from the power adapter. The 'Cycle Count : 144' is not increase when I'm using power adapter source and the battery can stand for 1000 full charge and discharge cycles as stated in the MacBook pro features.

 

So its safe for keep on plug-in to reduce the 'charge n discharge cycle' as it will not/cut-off charge to your battery after it's fully charged and keep the power source to power adapter only.

 

Thanks.

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最后更新：2017-08-21 22:54:24

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