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As long as the default output of a charger is 5V the Elipsa or any other 5V USB device will only take as much power as it wants. A charger has to match the required voltage (5V for phones, tablets, ereaders) and as a minimum supply the current. Power in Watts is Current x Volts. Thus 1.5A at 5V is 7.5W. The Elipsa (or any other ereader) must only get 5V no matter what the Watts rating is. The device decides the current to take.
A true USB-C charger can do higher voltages (some up to 20V 5A = 100W), but if it does more than 5V by default it's rubbish, should be returned and possibly banned from market as the FCC / CE / CSA etc mark must be fake.
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