187      iPhone_iPad_Mac_apple

Which is better to save the battery life?

Hello, I have a Macbook pro 2016. I work all day on my laptop, should I leave it plugged in or wait till the battery drains and plug it back? Which is better to save the battery life?

You'll use no battery life when it is plugged into the mains.  When it is not plugged in I would use the machine down to about ten to fifteen %, then plug in.

You can take it off charge at any time or leave it on charge overnight without causing a problem.

This document from Apple is very helpful.

https://www.apple.com/uk/batteries/maximizing-performance/

A lithium battery is a lithium battery is a lithium battery. I'd say keep it plugged in and not cycle the battery for prolonged battery life. With the occasional 10 to 15 percent drain and full charge every month or so the battery should last you a decade. My older MacBook Air and MacBook Pro have the original battery and it's still going strong five years in, my newer MacBook Pro retina is starting shut it's self down at 40 percent if I use a high draining app like premiere pro cc.  The only difference is that I used the newer MacBook Pro retina with battery power often and went through a lot of charge cycles where as the older MacBook air and MacBook Pro was used with power adapter plugged in most of it's life.

Hope this helped

Hi,

Today’s lithium ion batteries are completely different than batteries of the past, and some people still live in the past regarding battery care, such as advising you to “calibrate” your battery, which is totally unnecessary, or don’t leave your Mac notebook plugged in all the time. Given that, there are vastly differing opinions on how to treat Mac batteries.

If you run using the power adapter as much as possible, then you're saving "cycles" of which your battery has limited amount of (Apple claims “up to 1000” cycles). Age will also take its toll on a battery, no matter the usage. Some people will recommend running the battery down about 75% at once a month to keep it "exercised" which Lithium Ion batteries do need some of, but Apple has built that in to their charging circuit; after charging to 100% the battery won't charge anymore until it runs down to about 95% (which will occur naturally over time even with it plugged in), then charge it back up to 100%, etc.

Apple doesn’t say there’s anything wrong with leaving your Mac notebook plugged in all the time, nor do they say you need to discharge it ever (unless you’re not going to use your Mac portable long term) so they don’t think it’s a problem either: https://www.apple.com/batteries/maximizing-performance/

If, on the other hand, you want/need to use your battery with any frequency, go ahead, that’s why it’s there, to make your Mac portable and able to run out in the field with no power supply available.

You can run your Mac on battery for a little bit, then charge it back up to whatever level you want, and repeat this as many times as you want.

Although, in general, "common knowledge" is that it's not good to run down lithium-ion batteries all the way until they die, Apple doesn't say there's anything wrong with running your battery down to the point the OS puts your Mac to sleep.

In short, you can use the battery any way you want to, but the more time you spend using the power adapter, the fewer cycles you'll take away from the battery's life, thereby prolonging it as far as cycles are concerned.

Three important ideas:

1) fully discharging the battery to 0% charge is a very bad idea. Don't do it. When your computer indicates you are working on reserve, look for an electrical outlet or wind down your work quickly and put the computer to sleep or shut it down.

2) a battery life is measured in cycles, a cycle representing using the charge of a battery and it's recharging. From 100% to 5% is nearly a full cycle. Discharging to from 100% to 50% and recharging twice is a full cycle. Currently Apple says you can expect your battery to last 1000 discharges and still provide you with 80% of the time you got when it was new. My experience is that a) that's just about right and b) the battery begins to deteriorate at a much faster pace after you've reached 1000 cycles.

3) keeping the battery plugged in all the time is also not a good idea. Apple recommends that once or twice a month you use the computer on battery. Since I have long stretches of time when I don't use my notebook on battery, I've set a repeating reminder for every other Saturday to use the computer during the weekend on battery.

Keeping these 3 things in mind my 2011 MBA battery lasted about 4 years before needing to be replaced and my 2015 MBP still gives me like new battery performance.

dwb wrote:

 

Apple recommends that once or twice a month you use the computer on battery.

Where does it say that?

As I said, "Apple has built that in to their charging circuit; after charging to 100% the battery won't charge anymore until it runs down to about 95% (which will occur naturally over time even with it plugged in), then charge it back up to 100%, etc."

最后更新：2017-10-10 00:11:46

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