Underpowered Charger?

Hi, I just bought a new Titanium MD-1600L battery charger. I noticed underneath the charger, it says it has an input of 2.1A, but the power adapter supplied only has an output of 2.0A. Do you think I should buy a new power adapter?

Is it a 12V power adapter? This results in 24W. More than enough for 16 bays nihm at 0.5A (16*1.5*0.5=12W).