Here's some references to cell sizes and their names, Pila and Wolf-eyes make 4 cell sizes... they are roughly the same as the "industry" sizes by the following chart.
AW follows the "normal" cell naming structure described below:
mm diameter x mm length, the 0 on the end stands for cylindrical.
a 21370 cell would be 21mm diameter, 37mm long, cylindrical.
AW...WE...PILA
17500/150B/300S=1.5x length of a CR123 and slightly thicker, fits most SF bodies. capacity ~1000-1100mAh
18500/150A/300P=1.5x length of a CR123 and quite a bit thicker, fits WE, Pila, Leef bodies, and some other chinese lights. capacity ~1400-1500mAh
17670/168B/600S= 2x length of a CR123 and slightly thicker, fits most SF bodies. capacity ~1500-1600mAh
18650/168A/600P=2x length of a CR123 and quite a bit thicker, fits WE, Pila, Leef bodies, and some other chinese lights. capacity ~1800-2400mAh
the 123 reference:
16340=16320=16330=CR123A=R123=RCR123A. we have lots of ways we "short-hand" these common cells, often just called "123" in reference to this size cell.
Primary CR123As: 3.0V 1300mAh
Li-Ion RCR123As: 3.7V ~600-800mAh
more size references
15270=CR2 lithium photo battery size
14670=4/3AA (often used in some SF bodies that are so narrow, that a 17670 will not fit, also used in mag-light mods a lot)
14500= same size as a AA cell
14250= same diameter, half the length of an AA cell
10440= AAA cell size
There are a lot more cells out there, this is just some of the stuff we see around here pretty commonly.
