So long as the output is 5V any larger current device will not overload your Kobo, however, using a smaller device that cannot output sufficient current may cause the charger to burn up. You should use a charger that outputs 5V and at least 700 mA.
Using less may be ok with extended charger times but be sure and see if the charger gets hot. If so, do not use it. The Kobo device like all devices that connect to a computer can scale back their current needs and extend the time to charge the device, since a computer is only guaranteed to provide 500mA, and may be less if you are sharing the port with multiple devices. However, a dumb charger may not be able to tell the eBook reader to scale back its requirements.
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