Why my battery Amperage show a negative value?

Question

Level 1

1 points

Why my battery Amperage show a negative value?

Battery Information:

Model Information:
Serial Number: SMP-bq20z951-3964-2a6b
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): 1016
Fully charged: No
Charging: No
Full charge capacity (mAh): 4596
Health Information:
Cycle count: 2
Condition: Good
Battery Installed: Yes
Amperage (mA): -2195
Voltage (mV): 10795

System Power Settings:

AC Power:
System Sleep Timer (Minutes): 0
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
GPUSwitch: 2
Battery Power:
System Sleep Timer (Minutes): 1
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 1
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
GPUSwitch: 2
Reduce Brightness: Yes

Hardware Configuration:

UPS Installed: No

AC Charger Information:

Connected: No
Charging: No

MacBook Pro, Mac OS X (10.5.8), MacBookPro5,1

Posted on Jan 16, 2011 7:55 PM

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Answer 1

Best reply

stedman1

Community+ 2024

Level 10

256,548 points

Jan 16, 2011 8:39 PM in response to Jean1005

Hi Jean1005: The negative number indicates that your battery is discharging. This is perfectly normal if you are running on battery.

Hope this helps
Stedman

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Answer 2

Jan 19, 2011 8:58 AM in response to stedman1

I am seeing a negative amperage on my battery when I am plugged into the power adapter. Green light on, full charge showing. Here's my current system profiler stats:

Model Information:
Serial Number: W0043P6M5BX0A
Manufacturer: SMP
Device name: bq20z451
Pack Lot Code: 0000
PCB Lot Code: 0000
Firmware Version: 0201
Hardware Revision: 000a
Cell Revision: 0157
Charge Information:
Charge remaining (mAh): 6769
Fully charged: Yes
Charging: No
Full charge capacity (mAh): 6824
Health Information:
Cycle count: 3
Condition: Normal
Battery Installed: Yes
Amperage (mA): -1365
Voltage (mV): 12299

This MBP is a refurb 15" i5, exactly 2 days old. It seems to me that I shouldn't have a negative amperage if I am running off the power adapter.

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Answer 3

eww

Level 9

53,028 points

Jan 19, 2011 11:01 AM in response to jtotheizzoe

Your battery shows a negative amperage whenever it isn't being charged. When it reaches full charge, charging stops until the battery gradually drains to below 95% of full charge. This is normal and as designed. Charging will restart when the battery gets below 95%.

Message was edited by: eww

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Answer 4

Mar 23, 2012 2:58 PM in response to Jean1005

Battery Information:

Model Information:

Serial Number: D86104608S1DGDLAB

Manufacturer: SMP

Device Name: bq20z451

Pack Lot Code: 0000

PCB Lot Code: 0000

Firmware Version: 0406

Hardware Revision: 0002

Cell Revision: 0158

Charge Information:

Charge Remaining (mAh): 1827

Fully Charged: No

Charging: No

Full Charge Capacity (mAh): 6363

Health Information:

Cycle Count: 342

Condition: Normal

Battery Installed: Yes

Amperage (mA): -4

Voltage (mV): 11229

** Current battery charge: 29%

and the battery isn't charging, it's showing the green light. I doubt this is not the way it was supposed to be. what can be the possible reason?

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Answer 5

chingoza

Level 1

8 points

Jun 22, 2012 6:57 PM in response to eww

restart charge 95% up

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