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First the ratings on the chargers are supposed to be what it is designed to be able to supply at its rated voltage. Most of these "chargers", are simple Class 2 transformers. The charging circuits of most modern devices can test a USB power source and establish if there is too much voltage drop at the device's higher/faster charging rate and will limit the current draw to charge the battery at a lower/slower rate. Most also can adjust the charging rate based on the battery's internal temperature. The electro-chemical charging process itself will change the amount and rate of current draw, as the battery charges.
That said, what kills/wears down these batteries is HEAT. The internal heat that the charging process generates. The amount of internal heat generated during the charging process is directly related to the amount and rate of current drawn. These, and most other batteries, last significantly longer if they are charged at a lower/slower rate.
I charge all my USB charged devices using a .5A/500mA charger, and for my ereaders, including my Kobo AuraHDs, it still only takes a few hours to return them to full power.
(For my main AuraHD, it gets enough charging from the amount of time I have it connected to my PC fiddling with it, that I seldom use the charger on it.)
Luck;
Ken
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