Running my MBP without the battery.

jephyb

macrumors newbie
Original poster
Jul 10, 2006
20
0
Cleveland, OH
Hey all,

Just curious... I run my 2.33 GHz MBP as a desktop computer with AC power a lot and usually use a secondary monitor as the main display. Since it's not the best practice to always have the MBP running off of AC power (instead of the battery) because this can decrease battery life, I was wondering if you think it'd be safe to just remove the battery from the MBP as long as I'm using it for more of a "desktop" unit than a mobile unit. I'm also using a Griffin Elevator stand (if that matter for any reason). Any thoughts?

Jephy.
 

Luis

macrumors 65816
Jul 19, 2006
1,228
0
Costa Rica
It's ok to do so. However, bear in mind that if you disconnect the AC power, the computer will automatically shut down and you will lose whatever you were working on. Other than that, do it.
 

The Stig

macrumors 6502a
Nov 4, 2006
673
0
On the track
It's ok to do so. However, bear in mind that if you disconnect the AC power, the computer will automatically shut down and you will lose whatever you were working on. Other than that, do it.
I agree. Would you ever have to be careful. The magsafe can be so easy to knock out too! I knock mine out all the time even when it is in a "safe" spot.

The best idea would be to run off the battery until it is also dead and then plug it in until it was full and then run off the battery again. You don't want to do that everyday. Apple says if you are running off A/C that you would run your battery down every day or two.

The Stig
 

kolax

macrumors G3
Mar 20, 2007
9,186
115
Not sure if it still applies to the MBP's but I heard that if you take the battery out, the CPU will only run 1 core or half its performance.

Something like that - someone could clarify that for me though.
 

myke323

macrumors regular
May 17, 2006
124
2
i thought you weren't supposed to remove the battery and run off AC. i'm not sure the exact reason, but i thought i had read that it was not a good thing to do...

but i'd like to know more because i mainly use my MBP at my desk and would like to do the same thing...
 

blurb23

macrumors 6502a
Feb 25, 2007
524
0
Not sure if it still applies to the MBP's but I heard that if you take the battery out, the CPU will only run 1 core or half its performance.

Something like that - someone could clarify that for me though.
I think it throttles down to 1 Ghz.
 

FuzzyinLondon

macrumors newbie
Apr 14, 2007
6
0
Not sure if it still applies to the MBP's but I heard that if you take the battery out, the CPU will only run 1 core or half its performance.

Something like that - someone could clarify that for me though.
I've heard that too and it was certainly the case with the core duo machines and I think it is also the case with the core 2 duos too. Therefore you're effectively handicapping your machine if you do so and, like another poster mentioned, risking all your work if the magsafe pops out by accident.

The main point to make is that you're not really doing your machine any harm running it off AC. The problem comes if you never use the battery. Just make sure to run it off the battery every once in a while to 'exercise' it as it were. I would do a calibration every couple of months or so too to.
 

overcast

macrumors 6502a
Jun 27, 2007
995
2
Rochester, NY
Not sure if it still applies to the MBP's but I heard that if you take the battery out, the CPU will only run 1 core or half its performance.

Something like that - someone could clarify that for me though.
That makes no sense at all. Taking the battery out assumes you have endless power through the AC. If anything it should be when you are NOT on AC.
 

Wolfpup

macrumors 68030
Sep 7, 2006
2,728
66
I think it throttles down to 1 Ghz.
Yeah, that's what I read (I think on Apple's site).

Bizarrely, it supposedly may not have enough power from the power supply to run it at full blast, which is why it does that. That makes zero sense to me though. I mean releasing a system with a power supply that can't actually supply enough power...?
 

kolax

macrumors G3
Mar 20, 2007
9,186
115
That makes no sense at all. Taking the battery out assumes you have endless power through the AC. If anything it should be when you are NOT on AC.
Maybe you should read the other posts concerning my comment before you post something like that ;)
 

Luis

macrumors 65816
Jul 19, 2006
1,228
0
Costa Rica
That makes no sense at all. Taking the battery out assumes you have endless power through the AC. If anything it should be when you are NOT on AC.
Yeah, endless power that can be cut out unexpectedly at any moment. Especially with magsafe releasing so easily.
 

ScottDrummer

macrumors 6502
Jun 27, 2007
339
0
Canada
im no electrician, but considering an average PC/tower/macpro psu kicks out 200W +, the power from a mac charger is 85W, therefore extra wattage is prolly needed from the battery to support running of both cores. the charger is exactly that - a charger. not really an external power source like on a tower or mac pro. I assume with a battery in, the charger can act as an external power source.
 

overcast

macrumors 6502a
Jun 27, 2007
995
2
Rochester, NY
im no electrician, but considering an average PC/tower/macpro psu kicks out 200W +, the power from a mac charger is 85W, therefore extra wattage is prolly needed from the battery to support running of both cores. the charger is exactly that - a charger. not really an external power source like on a tower or mac pro. I assume with a battery in, the charger can act as an external power source.
lol, no laptop is using anywhere near 200W. Have a look at the output power rating for a battery. The charger is more then adequate to run it. The external power source is called your power grid.
 

Wolfpup

macrumors 68030
Sep 7, 2006
2,728
66
im no electrician, but considering an average PC/tower/macpro psu kicks out 200W +, the power from a mac charger is 85W, therefore extra wattage is prolly needed from the battery to support running of both cores. the charger is exactly that - a charger. not really an external power source like on a tower or mac pro. I assume with a battery in, the charger can act as an external power source.
The "charger" is really the unit's power supply, and if it isn't quite large enough, they should make it provide more power, not skimp out and rely on the batter to pick up the slack.

I've NEVER heard of notebooks have this issue until this. Dell's XPS 1710 even came with a bigger power supply to handle it's Geforce 7950GTX versus the 7900GS in the 1705.
 

SuperCompu2

macrumors 6502a
Jul 23, 2006
852
1
MA
Mac Pros only have 200w PSUs?

My Gigabit ethernet G4 has a 220w I think...I guess I just imagined an array of hard drives and a beastly Gfx card would consume more power, along with, you know, 8 cores. (I only have two)
 

overcast

macrumors 6502a
Jun 27, 2007
995
2
Rochester, NY
Mac Pros only have 200w PSUs?

My Gigabit ethernet G4 has a 220w I think...I guess I just imagined an array of hard drives and a beastly Gfx card would consume more power, along with, you know, 8 cores. (I only have two)
No, MacPro's have 1000w power supplies. That doesn't mean they use 1000w. A highend gaming rig can easily get by with 500w, typically using maybe 250-350w. The whole watt race with power supply manufacturers is just marketing.
 

jephyb

macrumors newbie
Original poster
Jul 10, 2006
20
0
Cleveland, OH
It is rather interesting though... When I had the battery out and running soley on AC power and using that external monitor, I swore Warcraft III didn't run NEARLY as nice... It was still very choppy and even caused a greater amount of lag for me. I found when I actually quit the application, put the battery back in, and booted the game up again it ran as smoothly as it has in the past.

I'm just concerned about killing the battery on this thing too soon. I suppose that what AppleCare is for, but there's some stipulation with battery replacements... Like, they won't replace the battery if you've killed X amount of cycles on it...or something along those lines.
 

Luis

macrumors 65816
Jul 19, 2006
1,228
0
Costa Rica
Oh so throttling down the CPU will fix that? What does that have to do with a battery? :confused:
The charger does not have enough power to run both cores, as someone already said. It is a "charger" after all, not an external power supply. It can act as one, but is not designed for that.
 

Wolfpup

macrumors 68030
Sep 7, 2006
2,728
66
The charger does not have enough power to run both cores, as someone already said. It is a "charger" after all, not an external power supply. It can act as one, but is not designed for that.
Yes, it is. It's a power supply. I said it before and I'll say it again. If that adapter doesn't provide enough power to run the system at full blast, Apple needs to provide a bigger/better one.

What happens when you run your system at full blast continuously? There's no reason you shouldn't be able to, but basically Apple is saying you can't with this thing. They're apparently expecting it to have idle time for the battery to catch up. That's an insane design.

And this whole "2 core" thing has nothing to do with anything. The CPU's one of the bigger power draws, as is the GPU, the screen, etc.
 

aquajet

macrumors 68020
Feb 12, 2005
2,384
0
VA
Yes, it is. It's a power supply. I said it before and I'll say it again. If that adapter doesn't provide enough power to run the system at full blast, Apple needs to provide a bigger/better one.

What happens when you run your system at full blast continuously? There's no reason you shouldn't be able to, but basically Apple is saying you can't with this thing. They're apparently expecting it to have idle time for the battery to catch up. That's an insane design.

And this whole "2 core" thing has nothing to do with anything. The CPU's one of the bigger power draws, as is the GPU, the screen, etc.
You must be new to Apple. ;)

It's no secret Apple make compromises from time to time. In this case, it's a less powerful power supply in order to reduce size and weight. Does this affect the performance of the machine? No. Is it something to worry about? Not until the battery is old and unable to hold a charge.
 

Wolfpup

macrumors 68030
Sep 7, 2006
2,728
66
You must be new to Apple. ;)

It's no secret Apple make compromises from time to time. In this case, it's a less powerful power supply in order to reduce size and weight. Does this affect the performance of the machine? No. Is it something to worry about? Not until the battery is old and unable to hold a charge.
Yes, it does affect it's performance if you can't actually use the machine at full blast. And it's just absurd-I think a defect-to sell a system with a power supply that's too small. You'd swear people are falling over from the "weight" of these things or something :D