IV = 8192 per Battery (2048 is EV), so its 1 Amp per Battery when it comes to output. If you want to run more than one battery but still get 1 Amp of output, add a Mode Selector Cover to the Battery Box and use that. The Button Panel would work just like the Selector Tag would.
And overall the Machine does the following calculation for Recipes.
First: Multiply EU/t with Duration to get Total EU
Second: Apply Overclocking Penalty and Efficiency Penalty, in case of the Multiblocks its just a flat 50%, so the Total EU gets doubled.
Third: Each tick it reduces the Total EU by whatever EU you inserted until it reaches 0 and produces the Recipe.