I have been having problems with my battery discharging at a fast rate (about 5% discharge per hour) when the Laptop is switched off and the power cable unplugged. I have discovered the cause was an external hard drive plugged into the USB port. If I left the external drive plugged in when the laptop was switched off the battery keeps trying to power it, even though every thing else is switrched off. The immediate solution is do not leave external drives plugged in when the laptop is switched off. However Acer needs to address this for a permanent solution.
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