MB won't run from charged battery

Hi,
My MB has developed a problem in which it will only run when connected to the mains. The battery is fully charged but within a few seconds of removing the mains lead it all goes black. The MB is less than 2 years old and I have had no previous problems. I have copied the battery information (below)
Battery Information:
Model Information:
Serial Number: DP-ASMB016-3752-26f9
Manufacturer: DP
Device name: ASMB016
Pack Lot Code: 0002
PCB Lot Code: 0000
Firmware Version: 102a
Hardware Revision: 0500
Cell Revision: 0102
Charge Information:
Charge remaining (mAh): 4774
Fully charged: Yes
Charging: No
Full charge capacity (mAh): 4775
Health Information:
Cycle count: 121
Condition: Good
Battery Installed: Yes
Amperage (mA): 0
Voltage (mV): 12567
Any help will be very much appreciated!
Thanks
AlanMB

From the information you have posted, there is no obvious reason why your battery should be failing or why your MacBook is not working unplugged.
However, the first line of attack for any battery problem is to reset the SMC. Follow the instructions here:
http://support.apple.com/kb/HT1411
If that does not address your issue, you may need to call AppleCare or visit an Apple store.

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<Edited by Host>

Hi - here is the full information from System Profiler.
Battery Information:
Model Information:
Serial Number:    DP-AS***9ec
Manufacturer:    DP
Device name:    ASMB016
Pack Lot Code:    0002
PCB Lot Code:    0000
Firmware Version:    0110
Hardware Revision:    0500
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<Edited by Host>

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Message was edited by: spudnuty

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