Always good idea to have a spare battery holder for your 1C or 1D flashlight.
Holder will not work with TLL models.
1C = 4xAAA
1D = 4xAA
Very well made holders or battery mags, whichever you wish to call these but extras are nice to keep on hand and these are very well made and very sturdy so if you choose not to use a single D or C cell size battery or carry extras around which are about the same size and weight as the 4AAA cell or the 4AA cell with batteries loaded into them. I like to use Energizer Ultimate Lithium in the AA and the AAA cells for both these lights the C and D cell flashlights by Maratac, you just cant go wrong with these lights and cell holders and every bit worth the price as well.
These are nicely built. The description didn’t state if the AAAs were connected in series or parallel. I was expecting parallel but they are series. I’m glad I checked voltage before dropping in my light!