MacBook Pro :: Battery Consumption - Amperage Drain?
Nov 21, 2010
Getting fustrated with my Macbook Pro 15''. Could never get battery to last more than 5-6 hours. This is the MAX i can achieve, with great pains to enhance battery life.
Argh, what's wrong with my Macbook Pro?
Check out the amperage drain. At this rate the Macbook Pro wouldn't last more than 5 hours. This is with half brightness, only finder and Chrome open, and the battery recently calibrated.
The amperage drain increases to -1400+ when i have more tabs open, and a few other apps.
However there was this ONE RARE OCCASION, where my Macbook Pro would only drain between -700 to -800 amperage. This was in normal usage and the battery easily lasted closer to 8 hours. But somehow, i can never replicate this anymore!
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Sep 9, 2009
I have a unibody macbook pro 15 inch, 2.8 Ghz, 4gb ram, 500Gb HDD. There are various display settings like 1440x900, 1344x840, 1280x800, 1024x768 and so on till 640x480 (descending order). Will the battery consumption vary at different display settings? If so, how much of a difference will it make?
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Nov 4, 2009
I had my MBA rev B turned of for 3-4 weeks and when I turned it on today it was at 40% power. Is that normal that it to loose that much battery when turned off, are you seeing the same number? I know when in sleep mode that there is a pretty high loss even over night but turned off I thought it was minimal.
Seems higher than my previous Mac laptops.
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Nov 7, 2010
we all know flash is a battery eater so to prevent this is install click to flash then it will indicate every pages that runs flash has this word "flash" on webpage which is good thing.now, i am a netflix subscriber and to watch movies you have to install microsoft silverlight..i dont have any choice to install it. if i open a webpage for example cnn.com yahoo.com etc.. how can i determine that those sites are using silverlight?i believe silverlight will cause battery consumption like flash right?
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Mar 11, 2010
So I have a late 2008 MBP and the battery is draining way faster than it should. Coconut battery says that my battery capacity is at 93% and it only has 73 cycles but the battery has only been lasting 3 hours at best with a full charge, but most typically, it only lasts 2 hours while using the 9400m GPU and at idle. I have reset the battery per apple's instructions 2 times now and I have reset the SMC multiple times. this is what the system profiler says about my power capacity and consumption:
Model Information:
Serial Number:6N839TV313EB
Manufacturer:SMP
Device name:bq20z951
Pack Lot Code:0000
PCB Lot Code:0000
Firmware Version:002a
Hardware Revision:000a
Cell Revision:0100
Charge Information:
Charge remaining (mAh):3522
Fully charged:No
Charging:No
Full charge capacity (mAh):4226
Health Information:
Cycle count:72
Condition:Normal
Battery Installed:Yes
Amperage (mA):-1449
Voltage (mV):11830
This all happened out of nowhere one day, I used to get a solid 5 hours on each charge a month ago and now this.
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Jun 13, 2010
Is there a difference in using mbp with a headphone or built-in speakers in terms of battery consumption?
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Oct 2, 2010
I'm wondering, what is better for prolonging your macbook pro's battery life, is it
1. drain the battery, recharge it fully, plug out the source, drain it, and recharge it again
or
2. keep charging it whenever you have a power source and never drain it?
I've always been doing #2 because I use the laptop a lot and home and it would just be a hassle to keep switching the power source on and off.
But then I heard that it's bad if you overcharge your battery, so once in awhile I try to do #1. Last night, though, my friend told me it's bad for your battery if you drain it all the time.
So which is, in fact, good or bad for your mbp?
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Nov 16, 2010
I recall reading that if I keep my MBP plugged to the wall all the time ( I do), I should drain the battery to about 50% every 2-3 days, to keep the battery's juices flowing.
Personally I don't have the patience to do this all the time. Is this step really that important?
What are your thoughts?
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Jul 21, 2009
My MacBook shuts down when the battery drains all the way down. I'm pretty sure back in the days of PPC lappies, they went to sleep before the battery died. Is it supposed to shut down, or is something goofed?
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Aug 20, 2009
Question in the subject line, nothing more to add here other than i am getting bad battery life and only use FF... so was wondering.
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May 19, 2010
With mine, when I drain it completely, it just shuts down, i.e. it doesnt go to sleep mode as there is no pulsating light on the front right corner. Once I start charging, however, and I can again switch it on, it resumes where I left off, so the computer has saved the contents of the memory onto the hard disk. On my SR MBP it was different, it would actually go to sleep mode when the batteries were almost completely drained.
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Jul 12, 2010
After about two hours my battery on my 13" mbp is at 35% from 100%.
All i did was some web browsing and about half an hour of video chatting on ichat. My brightness is at halfway.
is this normal drain? the specs say 10 hours, but when i first got it it lived for about 6 hours, which was plenty for me.
i've noticed recently that my battery has been acting funny, i'm thinking it may be because of my heavy audio work with garage band and reason.
the app coconut battery says my battery capacity is at 94% so I'm not sure what the problem is.
I've had this laptop for about 3 months, and i've properly calibrated it twice.
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Jun 14, 2012
lately I have noticed that even though I close the lid on my macbook pro, the battery continues to drain and it is very hard to wake it. I have to restart it several times to get to to open properbly.
Info:
macbook pro, Mac OS X (10.5.6)
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Sep 16, 2010
I have a 2010 13" MBP that will shut itself off instead of going to sleep when the battery is drained. I tried recalibrating and resetting the SMC, as well as disabling hibernate, but the same thing happens. The computer is barely a month old. Anybody else with a 13" experiencing this? I posted this issue on the Apple forums and someone replied stating that they heard Apple is looking into it, but usually occurs with i5 and i7 machines.
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Jun 22, 2009
I looked around and I find varying opinions. My laptop is mostly at home. Should I keep it plugged in when its full or should I let it drain? Please explain too.
Also, coconutBattery says I've used five cycles even though none of those were complete cycles. Is it just problems with the software or does it really count as a complete cycle?
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Mar 13, 2012
I’m hoping someone can help me troubleshoot some strange behaviour of my Macbook Pro4.1. It’s an early 2008 2.4Ghz Core 2 Duo. I’ve had this running perfectly for the past 2 months with an Apple 65W Magsafe Adaptor, although I recently got an 85w version so I’ve started using that for a bit. I recently read somewhere that it’s good to allow the battery run completely flat once a month or so, so I unplugged the adaptor last week and ran it off the battery for the afternoon. When it was almost done (10% charge left) I went for a shower and came back to find the Macbook powered down. I plugged in the Adaptor back in but I couldn’t get it to start. Â
I have to say at this point, that my 85w adaptor sometimes needs a wiggle at the magsafe end to get it to work. Despite this though I couldnât get the green power LED to light or the Macbook to boot up. I then tried my 65W adaptor, which is perfect, and although the LED lights up (first green and then amber) the macbook just doesnt power up with it. I tried the 85w one again the following day after leaving the macbook disconnected and battery removed overnight, and was pleased to find that it finally booted. Amazingly, despite having no power at all for the whole night it came back with all my applications running, safari tabs and the documents open! Anyway, I noticed from the menu bar that the battery was not charging and I couldnt seem to get it to charge. I ran it all day and the system profile showed that the Battery was about half full and had a ˜normal condition with about 187 charge cycles. However I cant run the Macbook off the battery. When the power cuts out from the 85w adaptor the whole macbook shuts down. The battery isn’t doing anything, even after charging all day and being half charged. What’s more neither of my 65w adaptors can start the macbook no matter how many times I try them. Only my 85w one can boot it, but it’s defective so very rarely seems to work. The 65W ones worked perfectly before,so I don’t know what’s changed.Â
I read the Apple guide to resetting the SMC and have now followed the procedure several times, but it hasn’t helped. I cannot boot the Mac any more. Does this Macbook come with an 85w adaptor or 65w? I’m confused because the 65w ones always worked until now. Also, the battery itself is only 60w. I’m going to purchase another 85w Adaptor, in the meantime any advice would be very welcome.
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Aug 30, 2014
So when I charge my macbook pro retina display too a 100% and then when I come back the next day and turn it on the battery has drained by itself by like 7%. Sometimes they are even drastic changes like 15-20%? I have just bought this macbook and is only a week and a half old? What should I do?
Info:
MacBook Pro with Retina display
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Mar 23, 2009
I have a sleep problem with my MacBook (9400M White). I recently resolved a problem where it wouldn't go to sleep by itself if left inactive on battery power (regardless of energy settings) by resetting the SMC and PRAM/NVRAM but now something else has popped up. Now, whenever I cycle my battery down to past the low battery warning popup, it just eventually completely dies. Shouldn't it go to sleep first? That's what my old iBook G4 would do. I doubt it's something related to the SMC or PRAM/NVRAM since I just reset those. What else can I do? I'm pretty sure my MacBook should still have enough juice go to sleep.
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Aug 20, 2010
Is it better, during normal usage, for example at home, where you could either charge your MacBook Pro or let the battery drain until it is used up (5%, ...).
Some people say that letting the battery cycle is the best option, yet other people, including my friend who had lost many many cycles even though he had attempted precautions (Dim screen brightness until one block remained, wireless off, bluetooth off) had said that having your laptop plugged in as muchas possible is the best option, as there would be no cycle change.
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Feb 21, 2009
When I close the lid on my MacBook Pro (Late 2008), the battery drains almost completely over a night or so! Very odd. Anyone else dealing with this? I reset the PRAM already.
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Aug 11, 2009
I just got my mac about a week ago. I'm currently arguing with my grandmother over whether it's better to leave the MBP plugged into the adapter all the time or let it drain the battery.
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Jun 25, 2010
I'm a happy owner of a MBP 2010, 15" i5, 2.4GHz.
Before some days I noticed that Snow Leopard installed its update 10.6.4.
Well no big problem but I have a sense that the time remaining without using AC adapter has slightly fell. Before, using only firefox for example I could see about 6 hours remaining (some minutes after powering on my mac). Now it hardly shows about 4+.
Has any other noticed that?
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Apr 19, 2012
I Have an October 2008 Macbook Unibody 13.3 and after installing Lion the CPU fan stays permanently on and the battery drains in 2 hours. What can I do to fix this?
Info:
MacBook (13-inch Aluminum Late 2008), Mac OS X (10.7.3)
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May 13, 2012
Last night I had a weird experience with my mid-2011 MacBook Pro; I went out to dinner and came back to find the cat had kicked the power cord out, draining the battery. I've had this happen before and wasn't too worried; it's always just restarted after I plugged it back in. This time, however, I plugged it in (getting, perplexingly, a green light on the cord) and nothing happened except for the sleep light slowly flashing; it didn't respond to any pressing on the power button, and the sleep light disappeared if I unplugged the cord. The battery test button on the side got one flashing light (meaning, I believe, a dead battery), which also didn't work if the computer was unplugged.
I left it plugged in while I hunted for info on the problem and about an hour later had just decided that I was going to have to take it in to the Genius Bar when it suddenly booted up. The cord light turned orange and it proceeded to fully recharge over the next two hours. Is this normal behavior after a battery drain? Should I be concerned? Is it worth taking the computer in to get the battery checked, or some other element of the comp? (some of the things I looked at were talking about the logic board, which is not a happy thought) iStat Pro claims the battery is at 41% health, 111 cycles, which I would think would mean it has some life in it yet.
Info:
MacBook Pro, Mac OS X (10.6.7)
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Jul 11, 2010
I keep seeing different anecdotes about people having lagging issues with the Intel HD graphics card. Is it really that bad? It would be a real pain to have to keep it on the nVidia card all the time, even when unplugged. I'm afraid that it will really drain the battery a lot faster than having the Intel on. Anyone have any estimates of this? It's one of the more worrying things about the Pro.
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Mar 30, 2010
Two quick questions:
- Is it bad to have the keyboard backlight always on? Will it somehow burn out the little lights?
- How much less battery power will I lose if I have the backlight always on? (I use Labtick).
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May 9, 2010
After discovering that the Tweetie app I use turns on the discrete GPU, I've been looking at alternatives to maximize battery life. A lot of twitter clients use Adobe Air, which also seems to get a bad rep, but is that because it drains battery life too, or because it's just buggy otherwise? So far I've been using twhirl without any obvious issues, and I'm testing out the battery usage with that running. I have to admit, I didn't notice any significant battery drain when Tweetie was running, so maybe I'm just overreacting here. If I remember right I got a little over 6 hours, and installed Tweetie about two hours after I turned my MacBook on then. I'd actually prefer twhirl since I use that on the desktop and I'm just used to it, but not if Adobe Air is going to cause problems on my shiny new MacBook.
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Jul 7, 2010
Is it a substantial amount? Considering going magic mouse.
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Mar 28, 2012
Is there a way to enable a MBPro give more amperage to PSVita like iPad.. As you know when Mac detects and iPad connected to the USB port, it gives extra 1,5 A over 500mA standard USB port. Could we use the same thing for Sony's PS Vita? Or is this an Apple only feature like Apple backing its own products..
Info:MacBookPro, Mac OS X (10.7.3)
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Nov 15, 2010
Is it normal for SSDs to use the same or more power as a HD?
SSD
An OWC Mercury Exreme Pro 40GB SSD uses 2.2W-2.5W when active.
A WD SiliconEdge Blue 64GB SSD uses 2W when reading and 3.5W when writing.
An OCZ VERTEX 2 40GB SSD uses 2W when in operation.
HD
A WD Scorpio Blue (5400rpm, 2.5") 250GB HD uses 2.5W when writing/reading.
A WD Scorpio Black (7200rpm, 2.5") 250GB HD uses 2.5W when writing/reading.
A Hitachi Travelstar 5K750 (5400rpm, 2.5") 500GB HD uses 1.4W when writing/reading.
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