It really is inconvenient that the Kobo doesn't use standard USB 2.0 power for charging.
I wondered if it was following the USB 3.0 standard, but that only allows 900 mA, not 2000 mA.
The iPad requires 2100 mA so many USB sockets cannot supply it, but those that do seem to be able to charge the iPad.
The ASUS Transformer requires its own charger too. It uses the microUSB connector. I don't know exactly what the limitations are.
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