Why no convert to accept single 18650 OR 26650 battery? I modified the 650 lumen and 1000 lumen version of this light to accept BOTH single 18650 OR 26650.

On related note : I modified the Police Security branded 1050 lumen 6 D cell flashlight to accept 2 18650 OR 2 26650 batteries. The flashlight blows Maglite 6 D Cell flashlight in terms of lumen output and aggressive strike bezel head.