In the days of incans I loved the 2C format for the size and comfortability but the runtime/cost had me investing in D and 6V batteries for lights back then till I got a flourescent light then 6D was my go to. I now find that even though an alkaline D may outperform an 18650 at runtime at very very low light levels it has 3 times the volume of an 18650 which can way outperform it at moderate light output levels even in NIMH format. In other words with the space of about a dozen 18650s you have the power of a dozen D cells in the space it of 4D cells
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