Why does my MacBook Pro battery discharge even when the charger is plugged in?

I've been having a myriad of problems with my MacBook Pro's battery. The main problem is that when in use, the battery steadily discharges often at a very quick rate even when I have the charger plugged in, the only way I can get it to recharge is to close the lid or turn the computer off, however, it has recently started to take a very long time to recharge (I left it for 12 hours and it charged from 0% to 60%). I also noticed that while off, the charger light occassionaly goes green and then back to orange every few minutes. When I manage to get the battery up to 100% charge, it usually stays at 'Charged' for around 5 or 10 minutes and then it just comes up with 'Calculating...' as it slowly discharges, it also occassionaly claims that it is recharging and that it will take around 6 to 8 hours but it only charges about 1% of the battery and switches to 'Not charging'. Also, sometimes the charger light wont come on when it is plugged in and the Mac refuses to acknowledge it is plugged in for some time.
I took it to the Apple Store a few months ago and one of the Geniuses reset the System Management controller and did a quick hardware test which seemed to fix it but the problems returned soon after, I cannot enter the hardware test screen and subsequent attempts to reset the SMC have done nothing, he also tested the charger and tried it with another charger but it did not help. Hope you guys can help me as I am completely stumped by this and its beginning to annoy me as my Mac is becoming almost unusable.
System Specs:
MacBook Pro (13inch, Mid-2010)
Processor: 2.4GHz Intel Core 2 Duo
Memory: 4GB 1067MHz DDR3
Graphics: NVIDIA GeForce 320M (256MB)
Hard Drive: Toshiba 250GB (50GB devoted to Windows partition)
Software: Mac OS X Lion 10.7.2 (Also have a partition containing Windows 7 Ultimate)
Battery Information (from System Information):
Model Information:
Serial Number:          9G02903MAD3NB
Manufacturer:          DP
Device Name:          bq20z451
Pack Lot Code:          0
PCB Lot Code:          0
Firmware Version:          201
Hardware Revision:          2
Cell Revision:          164
Charge Information:
Charge Remaining (mAh):          509
Fully Charged:          No
Charging:          Yes
Full Charge Capacity (mAh):          5066
Health Information:
Cycle Count:          450
Condition:          Normal
Battery Installed:          Yes
Amperage (mA):          -742
Voltage (mV):          10807
Notice, the amperage is in Negative while the computer is plugged in!

Battery condition says normal but cycle count is on the high side.
May be better off with a new battery.
Hope everything turns out right.

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Model Information:
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http://pastebin.com/z91Sp3Kk
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Why does my MacBook Pro battery discharge even when the charger is plugged in?

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