MacBook battery amperage?

iamhammill

macrumors 6502
Original poster
Feb 20, 2006
286
0
York, PA
Can someone please check in system profiler to see what their battery amperage is. It's under the power tab.


I think this might be the cause of my shutdowns.


Thank you.

 

Josias

macrumors 68000
Mar 10, 2006
1,908
1
Full capacity (mAh): 5192
Remaining capacity (mAh): 5158
Voltage (mV): 12548
Cycles: 3

See MB specs in sig.
 

iamhammill

macrumors 6502
Original poster
Feb 20, 2006
286
0
York, PA
Josias said:
Full capacity (mAh): 5192
Remaining capacity (mAh): 5158
Voltage (mV): 12548
Cycles: 3

See MB specs in sig.

Thank you, but I'm most concerned with the battery amperage. What is the number on that?
 

Josias

macrumors 68000
Mar 10, 2006
1,908
1
iamhammill said:
Thank you, but I'm most concerned with the battery amperage. What is the number on that?
-30 mAh (it is plugged in now)
 

Rovman

macrumors regular
May 4, 2006
115
0
United Kingdom
Battery Information:

Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 5136
Remaining Capacity (mAh): 5105
Amperage (mA): -1134
Voltage (mV): 12393
Cycle Count: 18


Based on your Full charge capacity, it is my guess that you didn't do the Battery Calibration.
 

Mord

macrumors G4
Aug 24, 2003
10,090
21
UK
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 5083
Remaining Capacity (mAh): 2645
Amperage (mA): -1871
Voltage (mV): 11314
Cycle Count: 21

yes yes i've had it for a week and a half and i've completely hammered the battery.
 

iamhammill

macrumors 6502
Original poster
Feb 20, 2006
286
0
York, PA
Rovman said:
Based on your Full charge capacity, it is my guess that you didn't do the Battery Calibration.


Hmm I calibrated it the first day. Must have done something wrong.


I started the thread becuase my MacBook is randomly shutting down, and I read one user on the Apple forums say his problem was fixed with a new battery.
 

Rovman

macrumors regular
May 4, 2006
115
0
United Kingdom
Hmm I calibrated it the first day. Must have done something wrong.


I started the thread becuase my MacBook is randomly shutting down, and I read one user on the Apple forums say his problem was fixed with a new battery.
Maybe the battery is faulty, or you did something wrong. Either way your full capacity is pretty low for a brand new battery. Maybe you should try calibrating again.
 

jsw

Moderator emeritus
Mar 16, 2004
22,910
41
Andover, MA
iamhammill said:
I suppose I could give it a try.


Anyone know what causes the difference in amperage?
I'm pretty sure all that (the negative number) means is that you're discharging the battery (i.e., it isn't plugged in).

The fact that the capacity is so low so soon does possibly indicate a bad battery, though.
 

wxboss

macrumors member
May 13, 2006
87
0
Jax, FL
jsw said:
I'm pretty sure all that (the negative number) means is that you're discharging the battery (i.e., it isn't plugged in).

The fact that the capacity is so low so soon does possibly indicate a bad battery, though.
Yes, the battery could be bad. You may want to try reseting the PRAM and try another calibration. The proper way to calibrate is:
Charge MB to 100%;
Disconnect power and allow battery to run all the way down (disregard low battery warning) and let MB put itself in a low battery induced Sleep;
Let it stay in this state for 5 or more hours - just let it sit with an empty battery;
After 5 hours, connect power and charge it all the way to 100%.
 

Rovman

macrumors regular
May 4, 2006
115
0
United Kingdom
Charge MB to 100%;
Disconnect power and allow battery to run all the way down (disregard low battery warning) and let MB put itself in a low battery induced Sleep;
Let it stay in this state for 5 or more hours - just let it sit with an empty battery;
After 5 hours, connect power and charge it all the way to 100%.
Minor correction, once charged to 100%, leave it powered on and Plugged in for a further 2 hours before you start the discharge.
 

wxboss

macrumors member
May 13, 2006
87
0
Jax, FL
Rovman said:
Minor correction, once charged to 100%, leave it powered on and Plugged in for a further 2 hours before you start the discharge.
You're right! Good catch :)

My apologies for leaving that out.