what is the cycle count SUPPOSED to be?

here's the info from the system profiler:






AC Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 10
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Display Sleep Uses Dim: Yes
Battery Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 2
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes

Battery Information:

Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 2266
Remaining Capacity (mAh): 2210
Amperage (mA): -625
Voltage (mV): 12121
Cycle Count: 46

AC Charger Information:

Connected: Yes
Charging: No

Hardware Configuration:

UPS Installed: No

Message was edited by: itsmesunny

mac book pro, Mac OS X (10.4.11)

Posted on Jun 23, 2009 8:46 AM

Reply
12 replies

Jun 23, 2009 9:01 AM in response to itsmesunny

The cycle count is a measure of your battery usage. There is no "supposed to be" number. The more you use your battery, your more you will rack up cycles. A full cycle is basically from a fully charged battery to a fully discharged battery then to a fully charged battery again. Any percentage (or partial) discharge/charge cycle counts as a partial cycle. For example... if your battery is full and you let it discharge to about 50% and then recharge it to full, this will count as 1/2 cycle. You would need to do this twice to count as one cycle. Likewise, if you discharged your battery from full to 90% (10% used) and then recharged it, this would be 1/10th of a cycle. You would need to do this ten times to equal one cycle.

So it all depends on how you use your battery. Provided your signature is correct and you are using 10.4.11 (or that was the original version of your OS X version) and you are using your original battery... your cycle count seems to be fairly low (which is a good thing). That would indicate that you primarily use your machine plugged in. Of course it could also mean that you just use your computer very very seldom.

Jun 23, 2009 9:01 AM in response to JoeyR

JoeyR wrote:
The cycle count is a measure of your battery usage. There is no "supposed to be" number. The more you use your battery, your more you will rack up cycles. A full cycle is basically from a fully charged battery to a fully discharged battery then to a fully charged battery again. Any percentage (or partial) discharge/charge cycle counts as a partial cycle. For example... if your battery is full and you let it discharge to about 50% and then recharge it to full, this will count as 1/2 cycle. You would need to do this twice to count as one cycle. Likewise, if you discharged your battery from full to 90% (10% used) and then recharged it, this would be 1/10th of a cycle. You would need to do this ten times to equal one cycle.


I'd also note that a "cycle" will change over time as the battery inevitably loses capacity.

Jun 23, 2009 9:17 AM in response to y_p_w

y pw wrote:
I'd also note that a "cycle" will change over time as the battery inevitably loses capacity.


Semantics, perhaps, but a cycle is a cycle and will always be a cycle. As Apple states, +"A charge cycle means using all of the battery’s power..."+ It doesn't matter if a battery has a current maximum capacity of 10000 mAh or 185 mAh - a cycle means using all of that power, however much there is (though not necessarily all at once).

Now, if you mean the time it takes to cycle a battery, certainly that will change, as will the amount of charge used in a cycle.

Jun 23, 2009 9:23 AM in response to JoeyR

thanks. i guess i was asking a question such as: how much is a bag of groceries, right?
my apologies.

i'm using the mini battery logger which i cannot figure out how to post the info here.
i cannot copy and paste or get it on a url.

i'm in the red according to it.

it says:
cycle count = 46
voltage = 12121 (red)
max capacity = 2266 (red)
original capacity = 5600


this battery is a free replacement from apple. it says it's manufactured on 11-16-07.
the pro i got on 10-31-06.

i almost always using the power adaptor. one day it was on battery and all of a sudden it shut down at i think at 80 something %. no low level warning.

i thought i had calibrated it cuz i had read i need to do that.

anyway, i did a battery check with the mini battery logger and got those stats. it looks like
it's not charging completely.

"the battery has reached the 40% of it's original capacity" is the warning i just got when i unplugged the power adaptor and it was on 97% at that time.

so, is what i'm writing now making sense?

Message was edited by: itsmesunny

Message was edited by: itsmesunny

Jun 23, 2009 9:25 AM in response to itsmesunny

You should probably contact Apple. Your data and the sudden shutdown would seem to indicate a failing battery. A cycle count of 46 is low. You can expect to get very good performance up to about 300 cycles... and then, generally, a gradual loss after that. However, that does not mean that a battery can not suffer from faults not related to your cycle count. Only Apple will be able to let you know if your battery qualifies for a free replacement.

Jun 23, 2009 9:35 AM in response to JoeyR

lol - this already is a free replacement. i took advantage of that when the first one was getting
the symptoms that i read about here.

it qualified after i called them with the info. i never had apple care and my one year warranty had
already expired, but they replaced it. they had gotten alot of calls with the same problem.

i think i'll call anyway.

thanks!

Message was edited by: itsmesunny

Jun 23, 2009 9:41 AM in response to itsmesunny

Ah.. .sorry... didn't know what "mini battery logger" was... so I thought maybe it somehow looked at the serial number for the battery and told you it qualifies for a replacement. So you've had the replacement battery for about a year and a half now then. No harm in giving them a call. At this point, your initial battery and free replacement would seem to have lasted a reasonable period of time (even though the replacement seems to have failed)... It may just be time for a new battery.

Jun 23, 2009 10:43 AM in response to neuroanatomist

neuroanatomist wrote:
y pw wrote:
I'd also note that a "cycle" will change over time as the battery inevitably loses capacity.


Semantics, perhaps, but a cycle is a cycle and will always be a cycle. As Apple states, +"A charge cycle means using all of the battery’s power..."+ It doesn't matter if a battery has a current maximum capacity of 10000 mAh or 185 mAh - a cycle means using all of that power, however much there is (though not necessarily all at once).

Now, if you mean the time it takes to cycle a battery, certainly that will change, as will the amount of charge used in a cycle.


That's what I was getting at - that a "cycle" isn't a set amount of charge being used and recharged. It changes depending on the current health of the battery.

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what is the cycle count SUPPOSED to be?

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