There are also inserts for Maglites and new rechargeable batteries that don’t discharge much. Bike light tech is useful for that. I’ve always liked my maglite.
DK
Have they come up with an insert yet for something bigger than a 3 D-cell Maglite? I love mine and have yet to run the batteries even close to empty but I still want a 5 or 6 D cell for the ‘heft’...