You'll get a wide variety of opinions on the matter. But a middle-of-the-road suggestion would be around 700mA for AA and 400 mA for AAA Eneloops (or the closest choices that your charger offers). I don't know about the AAA's, but even a full 2A current for the AA is acceptable although it may somewhat degrade the overall longevity of the cells if they get very hot during charging.