I am not familiar with the Aventrade, but they say that you can use 3 batteries in their 4 batteries holder, so get two of them inside your new 2 D light, replace the bulb of the 2 D with a Xenon magnum Star for 5 cells (a Maglite product available sometimes from Home Depot or similar store).
use good grade AA Nimhs.
And you have done your first easy mod.
A couple of nights ago I was asked to do a beam shot with a Maglite 3 D at my target deer & bear (26 yards).
I put fresh Duracell D batteries in the Maglite (39 lumens) and here are the results:
Maglite 3 D
BOREALIS 1050 lumens
Yes, I know, I have to use the weed eater more oftem!
Cheers
Black Bear