Can the IdeaPad be charged using USB port?

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http://www.mobileread.com – I've tried to get info or charging the S2109 IdeaPad in the Android Users Forum but beyond the FAQ that says "most Android tablets can't be charged from the USB port" I get no response. "Most" clearly leaves some wiggle room, and I noticed that when I have my IdeaPad plugged into a USB port it at least says it's charging (although it can't be very cast because even leaving it for an hour or some doesn't change the charge level very much). So what's the deal on charging these? Are you stuck with the 5V 2.5 Amps charger with the round plug, or can you use any of the USB (HowTos)