My kid gave me a cool Camo LED flashlight for Xmas 2015 and the old batteries
have finally gotten too weak to be useful.. (They weren't even alkaline cells).
Since I use a lot of rechargeable nimh AA cells, I decided to use those in my
2 C-Cell flashlight. So, I was about to order some plastic adapters, when
I started reading the reviews.. Some were not good..
So, I used the plastic nozzle parts off an old CPAP mask hose and made two
AA battery holders. AA cells work great in this low current application..
I think you could roll up thin cardboard around AA cells, to form an adapter
for C cell flashlights..
Even if you are going to use plain AA alkaline cells to replace larger C-cells,
it might be worth your time. C-cells prices are going out of sight..
AA cells are pretty good for low current LED lights..
Cheers,
Rich