When at home, is it ok leave my MBP plugged in all day, minus an hour here and there?

Star Nuts

macrumors member
Original poster
Jun 24, 2012
84
0
Or should I only charge it when the battery is getting low? I've heard that when at 100%, the battery is longer used and this will extend the life of the battery. But I've also heard the opposite and that it'll confuse your battery and kill the hold time.
 

charlieegan3

macrumors 68020
Feb 16, 2012
2,395
14
U.K
As long as you do discharge the battery every now and then and do a complete recharge it should be ok.
 

haruhiko

macrumors 603
Sep 29, 2009
5,065
2,618
Or should I only charge it when the battery is getting low? I've heard that when at 100%, the battery is longer used and this will extend the life of the battery. But I've also heard the opposite and that it'll confuse your battery and kill the hold time.
You don't need to use your battery when you don't need to. Just plug it in. You don't want a lot of cycles with your battery. (Just discharge/recharge once a month is OK.)
 
Last edited:

Ricanlegend

macrumors 6502a
Apr 21, 2009
545
0
Bronx,Ny
Use your MacBook pro as you would use your cell phone, do you keep your cell phone plugged in all the time ? If you working on a big project sure keep it plug just make sure the next day to use the battery. I wouldn't care to much about how many cycles, the battery hold 80% of it's charge when around 1,000 cycle and this from my 2009 info , maybe someone can correct me if apple has update this number
 

cmdrmac

macrumors regular
Jun 24, 2012
133
4
IA, USA
True, but they also mention (under the Standard Maintenance heading):

If on the other hand, you use a desktop computer at work, and save a notebook for infrequent travel, Apple recommends charging and discharging its battery at least once per month.
I take that to mean that if you're not really being mobile with your laptop, just discharge the battery at least once a month and it's ok to leave it plugged in.
 

mape2k

macrumors regular
Apr 18, 2011
202
0
Germany
Wow where is ggj's copy and paste response? Does that guy actually sleep?
I secretly think that he has some sort of bot running that scans all the new threads and replies with the pre-formated answers :) Must have missed this one though..
 

bizzle

macrumors 6502a
Jun 29, 2008
936
35
It's fine. I've left tons of my Mac laptops plugged in for YEARS with the occasional discharge with ZERO issues. I run a 2009 MacBook (the non-unibody one) as a server and I just unplug it every once in a while and drain it down to 5%. Battery still works fine and better yet, it's like a built in UPS.

As others have said, I recommend a monthly discharge and recharge to be on the safe side.
 

boy-better-know

macrumors 65816
Jun 30, 2010
1,343
120
England
As well as a monthly discharge down to 0%, I also let it discharge to 50% every 4 days or so if I haven't taken my mac out to uni with me for a few days.
 

SlyMac

macrumors 6502
Jun 16, 2008
292
43
I think apples official response to this in their support pages is to completely discharge every month or so (I may be wrong on the exact time frame). Check their support pages to be sure.
 

AZREOSpecialist

macrumors 68020
Mar 15, 2009
2,115
925
Apple states that the ideal way to maintain your laptop's battery is to use it in the way it was intended. Run the laptop on battery power during the day when you are using it out in the field, then charge when you get home. Apple says that if you are NOT going to use the laptop in this fashion, to make sure you fully discharge and recharge your battery at least once a month.

I used my 2006 MacBook Pro 17" (bought in 2007) almost exclusively on AC power and guess what? The battery swelled up and blew itself out just three years later. With the sealed battery in my RMBP, I'm not taking any chances and have been running on battery power during the day without any problems.
 

GGJstudios

macrumors Westmere
May 16, 2008
44,419
756
Let's see if I can address a few of these:
  • You can charge your battery anytime it's convenient, at any percentage between 0-93%.
  • When the battery is fully charged, it will stop charging. It cannot overcharge.
  • When your Mac is plugged in, it can, under heavy workloads, draw power from both your battery and AC power, causing your battery to stop charging or drain.
  • It doesn't cause a problem if you operate your Mac plugged in, as long as you don't do it exclusively, as the battery needs to be used regularly.
  • It's fine to put cycles on your battery. That's what it's designed for.
  • You don't ever have to fully drain and recharge your battery.
  • No, I'm not a bot. Yes, I am human. Yes, I do sleep occasionally.
  • No, people don't search.
Run on battery whenever you need to and plug it in whenever you can. You can plug or unplug at any time, regardless of the charged percentage. Just make sure you don't run on AC power all the time, as your battery needs to be used regularly to stay healthy. This should answer most, if not all, of your battery/charging questions:
 

stuaz

macrumors 6502
Jun 16, 2012
446
1
Let's see if I can address a few of these:
  • You can charge your battery anytime it's convenient, at any percentage between 0-93%.
  • When the battery is fully charged, it will stop charging. It cannot overcharge.
  • When your Mac is plugged in, it can, under heavy workloads, draw power from both your battery and AC power, causing your battery to stop charging or drain.
  • It doesn't cause a problem if you operate your Mac plugged in, as long as you don't do it exclusively, as the battery needs to be used regularly.
  • It's fine to put cycles on your battery. That's what it's designed for.
  • You don't ever have to fully drain and recharge your battery.
  • No, I'm not a bot. Yes, I am human. Yes, I do sleep occasionally.
  • No, people don't search.
Run on battery whenever you need to and plug it in whenever you can. You can plug or unplug at any time, regardless of the charged percentage. Just make sure you don't run on AC power all the time, as your battery needs to be used regularly to stay healthy. This should answer most, if not all, of your battery/charging questions:
You never fail to disappoint GGJ! :)