From Heidelberg to Rostock it has here the charge level from 90% to 68% whole can hold, despite permanent load that is saying something. So if you still runs with an iPhone 3G or Galaxy S2 can strike confidently with this charger. Smartphones recent generations should still prefer to access properly 2A adapter.
Whether it reaches the 2000mA here I doubt it, I have no readings. (For the doubters: the regular charger has 1000mA and thus can be the battery level even during GPS, WLAN & co are actively increase)