I have lights in all sizes but "C" cell, but the only batteries I stock are AA & AAA alkaline and lithium and I just bought a solar charger for a shift to NiMH rechargeable batteries. D cells are for my Mag lites, all of which have LED bulbs. I keep fresh batteries in the "D" flashlights but I don't stock spares. Investing in high capacity NiMH D cells is an option, but the good ones are pricey.