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Efest Bad-tteries


We have always recommended AW cells for powering the Billet Box, but there are many other batteries that work great too. Until recently the Black Efest cells were just fine, however a recent change in their production has the cells way over sized and will no longer fit in the Billet Box. The numbers on the battery are a representation of their size, the billet box takes 16340, this equals 16mm diameter x 34 mm long. The new E-fests are 37 mm long, and will not fit in the Billet Box. Forcing them in will take a massive amount of force and will likely damage the box.