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View Full Version : My default is keeping the MBA plugged in. Bad for battery?




zub3qin
Apr 26, 2011, 06:30 AM
I've MRoogled but have been unable to get a definitive answer so I thought I'd ask here.

My default is to keep my MBA 13" ultimate plugged in while in use.

I hear so many contradictory things about what "should" be done.

Is this behavior fine or should I be running down the battery every few days?
How many battery cycles are these supposed to have anyway?

Thanks!



simsaladimbamba
Apr 26, 2011, 06:32 AM
Look here:
This should answer most, if not all, of your battery questions: Apple Notebook Battery FAQ (http://forums.macrumors.com/showpost.php?p=9875442&postcount=23)

miles01110
Apr 26, 2011, 06:33 AM
There is no good answer because it doesn't matter. Batteries can be replaced, lost productivity and wasted effort carefully trying to maintain a battery cannot.

Oli3000
Apr 26, 2011, 06:47 AM
Essentially, every 2-3 days run it down to 50%. Also, good practice to run it down completely and recalibrate once a month.

s2dio
Apr 26, 2011, 06:55 AM
is it a good practice to run the battery to almost empty (0:02 remaining) every day?

simsaladimbamba
Apr 26, 2011, 06:56 AM
is it a good practice to run the battery to almost empty (0:02 remaining) every day?

No. Maybe the following can help you?
This should answer most, if not all, of your battery questions: Apple Notebook Battery FAQ (http://forums.macrumors.com/showpost.php?p=9875442&postcount=23)

zub3qin
Apr 26, 2011, 07:07 AM
There is no good answer because it doesn't matter. Batteries can be replaced, lost productivity and wasted effort carefully trying to maintain a battery cannot.

I kind of subscribe to this theory.
Even with the poorest "battery" care, how much efficiency/life do you lose on the battery? 10%?

leman
Apr 26, 2011, 07:17 AM
I never took any particular care of my battery, using it with or without charger as it was most convenient for me (only recalibrating once in a while) and its still at 97% of the initial capacity after 16 month and 540 loadcycles. So: don't worry, just use your computer - it will be ok.

zub3qin
Apr 26, 2011, 07:27 AM
Is this good or bad for a 2 week old refurbished 13" MBA?


Charge Information:
Charge Remaining (mAh): 6362
Fully Charged: Yes
Charging: No
Full Charge Capacity (mAh): 6542
Health Information:
Cycle Count: 11
Condition: Normal
Battery Installed: Yes
Amperage (mA): -1577
Voltage (mV): 8163

robeddie
Apr 26, 2011, 08:05 AM
Is this good or bad for a 2 week old refurbished 13" MBA?


Charge Information:
Charge Remaining (mAh): 6362
Fully Charged: Yes
Charging: No
Full Charge Capacity (mAh): 6542
Health Information:
Cycle Count: 11
Condition: Normal
Battery Installed: Yes
Amperage (mA): -1577
Voltage (mV): 8163

I don't know what program you used to pull that up, but if you just download and use 'coconut battery' it will show you the original battery capacity and the current battery capacity. For instance, on my macbook pro, the original battery capacity was 4600 mAh, and the current is now 4337 mAh, so it's at 94% of it's original health. (coconut battery gives you that percentage of original health as well)

Coconut battery also lets you know the number of battery loadcycles you've gone through as well. It tells me I've gone through 153.

simsaladimbamba
Apr 26, 2011, 08:11 AM
I don't know what program you used to pull that up ...

Macintosh HD / Applications / Utilities / System Profiler > Hardware > Power

2IS
Apr 26, 2011, 09:10 AM
There is no good answer because it doesn't matter. Batteries can be replaced, lost productivity and wasted effort carefully trying to maintain a battery cannot.

I'm all for productivity but that theory is stretched mighty thin here. I'm not sure how much productivity he's going to lose by taking his left hand and pulling the magsafe connector out every once in a while. It literally takes <2 seconds. You don't have to be all OCD about the maintenance. How many times would you have to do that to equal the time it would take to order a new battery pack and replace it? Not to mention unplugging the magsafe is free, a new battery isn't.

Twe Foju
Apr 26, 2011, 12:03 PM
that FAQS should tell you pretty much everything

but this is what i do with my 4 year old MBP ( 2007 )

i usually use it until the battery warning pops up for me to charge it back, then when it's fully charged, i might leave it for another1/2 hour before i unplug it

and i usually do calibration every 2 months or so ( running the MBP until the battery reaches critical and goes to sleep, then charge it )

and so far, i can still manage a good 2 1/2 hours with my Original Battery that came with it from 2007

but i think since that time, Apple should have improve the battery that when it's fully charged, it actually doesn't really receive the full power anymore so your battery will not really washed out that quick like used to in 2007 product

ZipZap
Apr 26, 2011, 12:41 PM
I never took any particular care of my battery, using it with or without charger as it was most convenient for me (only recalibrating once in a while) and its still at 97% of the initial capacity after 16 month and 540 loadcycles. So: don't worry, just use your computer - it will be ok.

I agree...too much wasted time massaging batteries.

JesseW6889
Apr 26, 2011, 02:59 PM
just leave it plugged in, cycling it once a month is all the maintenance you need and is more than I can say I do

bri1232001
Apr 26, 2011, 05:55 PM
I never took any particular care of my battery, using it with or without charger as it was most convenient for me (only recalibrating once in a while) and its still at 97% of the initial capacity after 16 month and 540 loadcycles. So: don't worry, just use your computer - it will be ok.

Srsly?

60 cycles here
93% initial capacity.

Just recalibrated too.
:confused: