amilo A battery problem

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I have recently bought a Fujitsu-Siemens Amilo A. I have always used it with
the power adaptor and occurred to me that I have never tried the battery.
Well when I tried I got nothing. With the power adaptor plugged in the green
battery light is always on, removed, the laptop switches off. the power
options says no battery installed but device manager says the battery is
installed and working fine. I removed the battery and replaced it but
nothing happens.
Have I missed something? or do I have a dud battery?

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