Hi,
E Fest cells are good and like Bowtie said AW's are an awesome cell also. I use AW most of the time but get them from a reputable dealer , you won't be disappointed
Rich
A quick search suggests AW does not make a 18350 flat top. For the Challenger II the battery has to be an 18350 unprotected flat top due to internal size limitation of the Challenger II.
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