If want something obtusely expensive, then split a CR-V3.
A 3.0 volt primary 14500 cell.
The only benefit to be had is on turbo, but if you are a 'turbo junkie', then use a 14500 LiIon, and just don't run it that long (if you can't comfortably hold it, then it is too hot)
Energizer L91, of if you can find them, the Duracell Lithium primary AA's
Ni-Zn over Eneloops if you want better turbo performance