is 2.08a equal to 2080Mah??? if so...are you saying that at 5volts...a 510 atty usb would draw over 2000Mah??? I thought i can use a USB straight PT (with no battery) ..plug it in a USB AC power supply rated at 1000Mah...
mAh is a battery rating, it's not a 'real' unit. What 2000mAh means is that you can discharge that battery at 2000mA for 1 hour until it is depleted - the reason the chinese batteries are all over-rated is because they include the 0-2.2v discharge in that hour, despite the batteries having a safety cutoff at 2.2-2.5v (even unprotected ones).
You can get away with using a 1A wallwart because that what is was designed for, but can be overdriven. Over time theres a good chance that something inside of it will fry and it will no longer work, but wallwarts are cheap, so who cares?
On the units though, yes, 1000mA == 1A.
giga = 10^9 (G)
mega = 10^6 (M)
kilo = 10^3 (k)
milli = 10^-3 (m)
micro = 10^-6 (u)
nano = 10^-9 (n)
pico = 10^-12 (p)
We don't really deal with anything but the milli or unnamed unit for ecigs, with the noted exception of capacitors for some voltage regulators being in the microfarad range.