Thiskit will run with 3 protected 26650 cells.
It is also possible to use with any D26 or D36 drop in eather LED or incand as long as voltage match.
Genuine P60 inand will work fine and long using 4 NiMH cells.
Some LED modules will work with 3.7~6 volts which is within range of 4 NiMH D cells.