Battery drains when power connected

Hi,
Early 2011 MBP 17inch battery drains when the power is connected. It seems to be that when the system is having some load battery is discharging even when the power is connected. Is this normal?
Regards

Yes it is normal, For Mac's that is. Apple doesn't supply a large enough AC power supply to both charge the battery, or stop it from being used, when the system is under heavy load. Once you start to run the system hard it will draw power from both the AC and the battery.

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