did not charge when I was doing my project

Hi,

I am a newby here, my MBP 15' (late 2011) did not charge when i was doing my project yesterday, the green light were disappeared, battery percentage dropped to 56%. I google the issue, I then realize that my battery is acting strange and please take a look at the MBP System Report stated as below: -

Manufacturer: SMP

Device Name: bq20z451

Pack Lot Code: 0

PCB Lot Code: 0

Firmware Version: 406

Hardware Revision: 2

Cell Revision: 158

Charge Information:

Charge Remaining (mAh): 469

Fully Charged: No

Charging: No

Full Charge Capacity (mAh): 6289

Health Information:

Cycle Count: 83

Condition: Normal

Battery Installed: Yes

Amperage (mA): 0

Voltage (mV): 11040

System Power Settings:

AC Power:

System Sleep Timer (Minutes): 10

Disk Sleep Timer (Minutes): 10

Display Sleep Timer (Minutes): 10

Wake on AC Change: No

Wake on Clamshell Open: Yes

Wake on LAN: Yes

Current Power Source: Yes

Display Sleep Uses Dim: Yes

GPUSwitch: 2

PrioritizeNetworkReachabilityOverSleep: 0

Standby Delay: 4200

Standby Enabled: 0

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

GPUSwitch: 2

Reduce Brightness: Yes

Standby Delay: 4200

Standby Enabled: 0

Hardware Configuration:

UPS Installed: No

AC Charger Information:

Connected: Yes

ID: 0x0000

Revision: 0x0000

Family: 0x0000

Serial Number: 0x00000000

Charging: No

I tried almost every mattered posted on the website such as SMC, reset PRAM but I still couldn't resolve the problem, after that my battery percentage went down to 7% and my battery is not charging!!! Is my battery died and needs to be replaced a new one? Any advise would be very much appreciated.

Thanks & regards

KL