MacBook Air won't charge and charger keeps the green light

I have tried a few chargers and it's not a charger problem because none of them has worked.
This is a MacBook Air from 2011.
The mac doesn't hold a charge anymore. Also, when the battery is at 0% the computer has turned extremely slow. At very few random times I goes up to 3% but I have to maintained it plugged in all the time otherwise it will go back to 0 and become unusable anymore.
The light is always green, and I have already tried doing an SMC reset.
Any ideas or has anyone encountered the same problem as I?
Thank you in advance

thanks for the help! here is the info you requested. This is with the charger connected:
Charge Information:
Charge Remaining (mAh):     0
Fully Charged:     No
Charging:     No
Full Charge Capacity (mAh):     6199
Health Information:
Cycle Count:     139
Condition:     Normal
Battery Installed:     Yes
Amperage (mA):     0
Voltage (mV):     7239

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I get no light on the power adaptor (45W) and no charge appearing on the onscreen icon.
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My MacBook Air won't charge, have tried SMC reset too..

I have noticed today that my MacBook Air won't charge. I changed the socket I was using to a different one in the house.
The charger itself is not hot. Has not been used at all today.
Have followed a link on here and tried an SMC reset to no avail.
This is what my system report has to say: (my charger is attached right now - no light)
Battery Information:
Model Information:
Serial Number:          D86207311M5DKRNAA
Manufacturer:          SMP
Device Name:          bq20z451
Pack Lot Code:          0
PCB Lot Code:          0
Firmware Version:          406
Hardware Revision:          000a
Cell Revision:          162
Charge Information:
Charge Remaining (mAh):          2369
Fully Charged:          No
Charging:          No
Full Charge Capacity (mAh):          6463
Health Information:
Cycle Count:          25
Condition:          Normal
Battery Installed:          Yes
Amperage (mA):          -1370
Voltage (mV):          7478
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
Display Sleep Uses Dim:          Yes
PrioritizeNetworkReachabilityOverSleep:          0
RestartAfterKernelPanic:          157680000
Standby Delay:          4200
Standby Enabled:          1
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
Current Power Source:          Yes
Display Sleep Uses Dim:          Yes
Reduce Brightness:          Yes
RestartAfterKernelPanic:          157680000
Standby Delay:          4200
Standby Enabled:          1
Hardware Configuration:
UPS Installed:          No
AC Charger Information:
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Charging:          No
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MacBook Air won't charge and charger keeps the green light

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