E series compatable battery tube for CR2 lithium cell:

Below, the tube is coupled with an Aleph 2 head and McE2S-FT (flat top) tail cap. (3.125" long)

The flange on the tail of the tube allows for secure grip even with an oversized head like Aleph 3 below:

A lanyard hole in the flange:

In a lineup:

With a twistie CR2 Aleph style light:

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