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If you charge the reader via computer usb, and later software shutdown/sleep your machine (without totally disconnect computer power source) and leave the reader still connect to the computer, the reader will keep displaying the "charge complete" or "charging", but the reader battery may becomes a power source. a lot more intensive power drain (than reading) may pour from reader battery to the computer motherboard. By the time you unplug usb (which may showing charging completed) to read, your reader may have lot less battery than than you think.
My PC can drain my fully charged reader to 2 bars in around 15 minutes.
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